When two oxygen atoms form a chemical bond in a system its energy decreases and stability increases.
When two atoms join together to form a chemical bond, they either transfer or share electrons to create a new molecule. The negatively charged particles known as electrons are found in various energy levels around the atomic nucleus.
The outer electrons of two oxygen atoms are drawn in by the nuclei of both atoms when they are in close proximity to one another. Two electrons from each atom are shared in this situation. An example of this is a double bond. Each oxygen atom contains a total of eight valence electrons because they share two pairs of them. Its outer energy level is filled, providing it the most stable configuration of electrons. In its simplest form, oxygen is a diatomic molecule. Since each oxygen only contains six electrons, it must share them with another oxygen to form two bonds. An example of this is a double bond.
Thus, When two oxygen atoms form a chemical bond in a system its energy decreases and stability increases.
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what is the approximate mole fraction of ethanol, c2h5oh, in an aqueous solution in which the ethanol concentration is 11.0 molal?
The mole fraction of ethanol is 0.165
What do you mean by mole fraction ?
There are several ways to indicate the concentration of the solution and mole fraction is one of them. Mole fraction is a unit of concentration. In the solution, the relative amount of solute and solvents are measured by the mole fraction and it is represented by “X.”
The mole fraction is the number of moles of a specific component in the solution divided by the total number of moles in the given solution.
Molecular Mass of Ethanol = 46g
11.0 molal = 11 moles in 1 L solution
Molecular mass of water = 18g
Density of water= 1kg/m3 = 1000g/l
So, Mass of water in 1l solution = 1000g
so moles = 1000/18 = 55.55 moles
Thus, mole fraction of ethanol = 11.0/ ( 11.0 + 55.6 ) = 0.165
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given your proposed electron pushing mechanism, list as many factors that could play a role in the success or failure of the reaction:
The factors that play the role in success is solvent, concentration of nucleophile and the substrate.
What is [tex]S_{N}2[/tex] reaction ?
When [tex]sp^{3}[/tex] hybridized carbon containing a leaving group and nucleophile attack from the remote side of the leaving group then the reaction is known as [tex]S_{N}2[/tex] reaction.
Factors depending on [tex]S_{N}2[/tex] reaction:
Solvent: Polar aprotic solvents are very useful for this reaction as they increase the intermediate concentration and also solvate the nucleophile. Nucleophile: More strong the nucleophile more is the rate of reaction.Substrate:1° substrate react faster than 2° than 3°Read more about [tex]S_{N}2[/tex] reaction:
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when 11.8 g of c8h18 underwent a combustion reaction with 8.84 g of o2, it produced 1.15 g of h2o. balance the reaction and answer the following questions. what is the mass (in g) of remaining oxygen gas?
It is given that its a combustion reaction, we know that the ending compounds are CO2 and H2O alone. To get this, we add O2 in a combustion reaction to our initial compound.
C8H18 + O2 ---> CO2 + H2O ( + trace amounts of C8H18 left) We are asked about the C8H18 left meaning we have a limiting reactant and it is not completely water and CO2 left due to the limiting reagent. So we are trying to find the excess reactant.
To balance the equation we must balance all molecules ;
2 C8H18 + 25 O2 ---> 16 CO2 + 18 H2O (not taking into account the combustion of air)
It is given that it is incomplete combustion so we must use the grams of product to calculate the amount of reactant used due to the limiting reagent
1.15 g H2O * ( 1 mol H2O / 18.01532 g H2O) *( 2 mol C8H18 / 18 mol H2O) * ( 1 mol C8H18 / 114.24 g C8H18) = 0.00111755 = 0.00118 g C8H18 reacted
11.8 g C8H18 in the initial reaction, 0.0118 g reacted to get 1.15 g H2O
11.8-0.00118 = 11.79882 = 11.8 g C8H18 left in the balanced equation (meaning almost none of it was reacted)
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The two dry sand samples are examined by changing one parameter. The independent variable, the one that is intentionally manipulated between the two samples, is the. Besides the amount of material, there is also another variable that is manipulated within each of the two mass groups and represented as three types. This independent variable is the. In each case, the dependent variable, the one that you measure the response in, is the.
The independent variable, the one that is intentionally manipulated between the two samples, is the mass of the each sample. there is also another variable that is manipulated This independent variable is the type of material used. In each case, the dependent variable, temperature.
Two dry sand sample are examined by changing one parameter. so, the independent variable, the one that is intentially changed between two samples is the mass of the each sample.
Besides the amount of material, there is also another variable that is manipulated within each of the two mass groups and represented as three types. This independent variable is the type of the material used.
In each case, the dependent variable, the one that you measure the response in, is the temperature over the time.
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Answer:
a. mass of each sample
b. type of material used
c. temperature over time
Explanation:
edge 2022!! i got it right ;)
refrigerant-134a at 800 kpa and 25°c is throttled to a temperature of -20°c. determine the pressure and the internal energy of the refrigerant at the final state.
The pressure and the internal energy of the refrigerant at the final state
Known data:80.74kJ/kg.
[tex]$$\begin{aligned}& \mathrm{R}-134 \mathrm{a} \\& P_1=800 \mathrm{kPa} \\& T_1=25^{\circ} \mathrm{C}\end{aligned}$$[/tex]
Unknowns:
[tex]$$\begin{aligned}& T_2=? \\& u_2=?\end{aligned}$$[/tex]
The pressure of the refrigerant in the final state is equal to the saturation pressure at -20 degrees Celsius.
[tex]$$\begin{aligned}& P_2=P_{\text {sat }, \text { at }-20^{\circ} \mathrm{C}}=132.82 \mathrm{kPa} \\& P_2=132.82 \mathrm{kPa}\end{aligned}$$[/tex]
State 1 is compressed liquid. Then the enthalpy is that of the saturated liquid at 25 degrees Celsius.
[tex]\h_1=h_{f, \text { at } 25^{\circ} \mathrm{C}}=86.405 \mathrm{~kJ} / \mathrm{kg}$$[/tex]
The throttling process of the refrigerant is isentalpic. The state 2 of the refrigerant is in the phase mixing region, so we have to calculate the quality 2.
[tex]x_2=\left(h_2-h_f\right) /\left(h_g-h_f\right)$$[/tex]
Where:
[tex]$$\begin{aligned}h_2 & =h_1=86.405 \mathrm{~kJ} / \mathrm{kg} \\h_f & =25.49 \mathrm{~kJ} / \mathrm{kg} \\h_g & =238.4 \mathrm{~kJ} / \mathrm{kg}\end{aligned}$$[/tex][tex]$$\begin{aligned}h_2 & =h_1=86.405 \mathrm{~kJ} / \mathrm{kg} \\h_f & =25.49 \mathrm{~kJ} / \mathrm{kg} \\h_g & =238.4 \mathrm{~kJ} / \mathrm{kg}\end{aligned}$$[/tex]
Substituting:
[tex]x_2=(86.405-25.49) /(238.4-25.49)=0.2861$$[/tex]
Now let's calculate the final internal energy of the refrigerant, remembering that the temperature is -[tex]$20 \mathrm{C}$[/tex].
[tex]u_2=u_f+x_2\left(u_g-u_f\right)$$[/tex]
Where :
[tex]$$\begin{aligned}& u_f=25.39 \mathrm{~kJ} / \mathrm{kg} \\& u_g=218.34 \mathrm{~kJ} / \mathrm{kg}\end{aligned}$$[/tex]
Substituting :
[tex]$$u_2=25.39+0.2861(218.84-25.39)=80.74 k J / k g$$[/tex]
[tex]$$u_2=80.74 \mathrm{~kJ} / \mathrm{kg}$$[/tex]
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Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of sodium sulfide and iron(II) nitrate are mixed. O Na+(aq) + NO3(aq) - NaNO3(s) O No reaction occurs. OS2-(aq) + Fe2+(aq) → FeS(s) O 2 Nat(aq) +52-(aq) + Fe2+(aq) + 2 NO3(aq) – 2 Nat(aq) + 2NO3 (aq) + 2 FeS(s) O 2 Na(aq) + 52 (aq) + Fe2+(aq) + 2 NO3 (aq) Fe2+(aq) + 52 (aq) + 2 NaNO3(s)
The net ionic equation for the reaction (if any) that occurs when aqueous solutions of sodium sulfide and iron(II) nitrate are mixed.
The answer is:-
[tex]2Na^{+}(aq) + S^{2-} + Fe^{2+} + 2NO_{3}^{-}(aq) -- > 2Na^{+}(aq) + 2NO_{3}^{-}(aq) + 2FeS(s)[/tex]
Ionic Equation:-
an ionic equation is a chemical equation in which the electrolytes in an aqueous solution are expressed as dissociated ions. Usually, this is a salt dissolved in water, where the ionic species are followed by (aq) in the equation to indicate they are in an aqueous solution.
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a mixture of neon and helium gases, at a total pressure of 798 mm hg, contains 3.93 grams of neon and 0.228 grams of helium. what is the partial pressure of each gas in the mixture?
The partial pressure of each gas in the mixture is 39.75 mm of hg and 179.43 mm of hg respectively.
In a combination of gases, each constituent fuel has a partial stress that is the notional strain of that constituent gas as if it alone occupied the whole volume of the original aggregate on the same temperature.
Calculation:-
Total pressure pressure = 798 mm hg
mass of neon gas = 3.93
molar mass = 20 g
moles = 3.93/20
= 0.1965 moles
mass of neon gas = 0.228 grams
molar mass = 4 g
moles = 0.228 / 4
= 0.057 moles
total moles = 0.2535
partial pressure of neon = moles of neon / total moles × total pressure
= 0.1965 moles/ 0.2535 × 798 mm hg
= 39.75 mm of hg
partial pressure of helium = moles of helium / total moles × total pressure
=0.057 moles / 0.2535 × 798 mm hg
= 179.43 mm of hg
The stress exerted by means of an person gasoline in a mixture is called its partial pressure. Assuming we've a combination of perfect gases, we are able to use the suitable gasoline regulation to solve problems concerning gases in a combination.The term partial stress is used whilst we've got a combination of two or numerous gases inside the identical extent, and it expresses the strain this is caused by every of the induvidual gases inside the mixture.
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sodium bromate is used in a mixture which dissolves gold from its ores. calculate the mass in grams of 4.68 mol of sodium bromate.
Step 1: Calculate the molar mass of sodium bromate.
The molar mass of sodium bromate (NaBrO3) is 150.89 g/mol.
Step 2: Calculate the mass in grams of 4.68 mol of sodium bromate.
To calculate the mass in grams of 4.68 mol of sodium bromate, we need to multiply the molar mass of sodium bromate (150.89 g/mol) by the number of moles (4.68 mol):
Mass = Molar mass x Number of moles
Mass = 150.89 g/mol x 4.68 mol
Mass = 706.30 g
What is Sodium bromate?
Sodium bromate is an inorganic compound of sodium and bromate, with the formula NaBrO3. It is a white, odorless, crystalline solid. Sodium bromate is used as an oxidizing agent in a variety of industrial and laboratory processes. It is also used in bleaching and dyeing textiles, and in the manufacture of certain pharmaceuticals. Sodium bromate is toxic, and exposure can cause adverse effects on the skin, eyes, and respiratory system.
What are Ores?
Ores are rocks or minerals from which useful elements or minerals can be extracted. They usually contain significant concentrations of metals such as copper, iron, gold, lead, and zinc. Ores are extracted through mining and processed to obtain the valuable elements.
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three disaccharides are important in the human diet: sucrose, lactose, and maltose. click and drag the monosaccharides to build each of the disaccharides below.
The monosaccharides to build each of the disaccharides are:
Glucose + fructose = sucrose
Galactose + glucose = lactose
glucose + glucose = maltose
What are monosaccharides examples?
The simplest carbohydrates, also called simple sugars, are plentiful in fruits. A monosaccharide is a carbohydrate consisting of one sugar unit.
What are the 4 monosaccharides?
Glucose is the most abundant monosaccharide. Galactose, mannose, fructose, and ribose are also of major biological importance.
What are the 3 disaccharides?
Disaccharides consist of two monosaccharide units, linked together with glycosidic bonds in the α or β orientation. The most important of them are sucrose, lactose, and maltose.
What are disaccharides and their functions?
Disaccharides act as an energy source for the body, just like any other carbohydrate. When we eat foods that contain disaccharides, our bodies break them down into simple sugars (monosaccharides) for absorption in the small intestine.
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what is the formal charge on the central atom in a molecule of o3? hint: it may be helpful to draw the lewis structure for this molecule
A molecule's formal charge is the total of the formal charges of each of the constituent atoms that make up that particular molecule.
What is the Lewis structural rule?
Hydrogen atoms can only make one bond, and they are always located at the ends of atom chains. Hydrogen is usually associated with carbon, nitrogen, or oxygen. Oxygen atoms normally do not bond to one another, with the exception of O2, O3, superoxides, and peroxides.
Describe Lewis's structure with an example.
The octet rule, which states that atoms share electrons so that each has eight in its outer shell, is the foundation of a Lewis structure. For instance, the outer shell of an oxygen atom has six electrons.
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alpha polonium crystalizes in a simple cubic unit cell with an edge length of 336 pm. whatis the density of alpha polonium (in g/cm^3)?
alpha polonium crystallizes in a simple cubic unit cell with an edge length of 336 pm, the density becomes 7.318 g/cm³.
What is unit cell?The smallest repeating unit with complete crystal structural symmetry is designated as a unit cell. The unit cell geometry, sometimes referred to as a parallelepiped, provides six lattice parameters, which are the lengths of the cell edges (a, b, and c) and the angles at which they are spaced apart ( α,β,γ ).
Given that,
alpha polonium crystallizes in a simple cubic unit cell with an edge length (a) of 336 pm.
As we know, the relation between radius (r) and edge length (a) for simple cubic unit cell is: 2 r = a
Thus, r = a/2
r = 336/2 [ given a = 336 pm]
r = 168 pm
Now, density (d) = (Z × M) / a³ × [tex]N_A[/tex]
Here, Z = number of atom in a simple cubic unit cell = 1
M = molecular weight of polonium
[tex]N_A[/tex] = Avogadro's no.
d = ( 1 × 209) / (168 ×10⁻¹²)³ × (6.023 × 10²³)
d = 7.318 × 10⁷ g/m³
d = 7.318 g/cm³
So, the density of alpha polonium is 7.318 g/cm³.
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The half-life of iodine-123 is 13. 3 hours. How much of a 25. 0 mg sample will remain after 39. 9 hours?.
Iodine-123, which has a 13.3-hour half-life and a 25 mg initial concentration, will have 3.09 mg after 39.9 hours.
Using a first-order kinetics equation,
log C = logC0-Kt/2.302
An arrangement of chemical reactions where the rate of the reaction is proportional to the amount of the reactant and is dependent on the concentration of just one reactant.
The half-life of idodine- 123 is 13.3 hours.
from the formula of half-life K can be calculated.
The period of time it takes for a sample's ingredient to decrease by half in your body is known as the half-life.
T1/2 = 0.693/ K
13.3 hours= 0.693/K
K= 0.052 [tex]hour^{-}[/tex]
Substituting the value of K, C0, and t in the equation of first-order kinetics
logC= log(25) - 0.052 × 39.9/ 2.303
logC = 1.39-0.90
logC= 0.49
C= antilog (0.49)
C= 3.09 mg
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What is the pH of a buffer made of 2. 00 M acetic acid CH3COOH and 2. 00 M sodium acetate NaCH3COO? [Hint: use the Henderson Hasselbalch Equation: PH = pKa + log [ base / acid ] ka of CH3COOH= 1. 8E-5 4. 74 5. 05 07. 98 6. 87 Question 6 (1 point) )Listen What is the molarity of LiOH if it is titrated against 50. 0 mL of 0. 200 M HNO3 and the end point was found to be at 40. 0 ml LiOH? [Hint: Set up first the balanced neutralization equation between the acid and the base]. A. 0. 187 M B. 0. 250 M C. 0. 215 M
A buffer solution containing 2.0 M acetic CH3COOH and 2.0 M of sodium acetate ion has a pH of 0.4ml.
What three kinds of buffer are there?
The caco3 acid buffer, the buffer ( ph, as well as the buffering of plasma make up your body's chemical buffer system. The first buffer is typically seen as being the most crucial since it is connected to the respiratory system, even though the second buffer is the most abundant.
What are buffer and pH with an example?
The pH of an acetic and sodium acetate solution in water is equivalent at 4.74. These solutions have a pH that is under seven. These solutions are made up of a salt of the a weak acid plus
Briefing:
To solve this the formula to use is
acetate=c1+v1/v2
Where c1 = 0.50 acetate ion
v1 = 8 ml of sodium acetate
v2 = 8 ml + 2 ml = 10 ml
When we out the values into the formula above we would have
= 0.5 x 0.8
= 0.4 M
The concentration of acetate ion in the buffer solution is equal to 0.4ml
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1. Find the elements sodium, oxygen, and phosphorus on the periodic table. Describe the monoatomic ions each would form. Then, given what you know about chemical bonding, describe and give the formulas for the types of ionic compounds they would produce with each other. Use the periodic table in the chemistry: problems and solutions book to help with your answers.
Sodium, oxygen, with phosphorus combine to generate the monoatomic substances Na2O (sodium oxide), Na3P (sodium phosphide), Na3PO3 (sodium phosphite), and Na3PO4 (sodium phosphate).
What does phosphorus do in the human body?All tissues and cells require phosphorus for their growth, upkeep, and repair, as well as for the creation of DNA or RNA, the genetic building blocks. Additionally, other minerals and vitamins like vitamin D, thyroid, magnesium, and zinc need phosphorus to be balanced and used.
What does phosphorus do in the human body?Extra phosphorus alters the body in ways that cause calcium to be drawn from your bones, weakening them. Additionally, harmful calcium deposits in the heart, lungs, eyes, and blood vessels are caused by elevated phosphorus and calcium levels. With time
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a certain weak base has a Kb of 7.10×10−7. what concentration of this base will produce a ph of 10.04? concentration:
The Concentration is 0.055 M
Solution:
pOH = 1/2(pKb - logC)
pOH = 14-pH = 14-10.31 = 3.69
pKb = -log kb = -log 7.100 x 10-7 = 64
3.69 = 1/2(6.12-log C)
Concentration = 0.055 M
Solution concentration is defined as the amount of solute present in a given volume of solution. It can be expressed as mass x mass percent of solution = mass of solute mass in solution × 100. mass x volume percent of solution = mass of solute mass in solution × 100.
By focusing, you can make better use of your resources and tackle problems more efficiently. When you concentrate, you are less likely to miss important information. Staying focused makes it easier to remember things. Focus means control of attention. It is the ability to focus the mind on a subject or an object.
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Draw the Lewis structure for the polyatomic carbonate (co} anion: Be sure to include all resonance structures that satisfy the octet rule ~ c_o]
The Lewis structure for polyatomic carbonate anion would be two oxygen atoms bonded with carbon atom with a single bond and one double bond is present.
There are three σ bonds and π bond around carbon atom in the Lewis structure of CO3^2- ion. According to the question caron has 4 valanced electrons. There are three oxygen atoms in CO32- ion,
Therefore,
Total valence electrons given by oxygen atoms = 6 *3 = 18
There are -2 charge on CO32- ion. Therefore, there are two more electrons which contribute to the valence electrons.
Total valence electrons = 4 + 18 + 2 = 24
Carbon has the more chance to be the center atom because carbon can show valance of 4. Oxygen's highest valence is 2. So, now we can build a sketch of CO3^2- ion.
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find the mass of aluminum requried to produce 1.32 l of hydrogen gas at stp from the single replacement reaction of aluminum and sulfuric acid
Predict the mass of hydrogen fuel produced when 2. seventy-three g of aluminum reacts in a single replacement reaction with extra sulphuric acid.
The yank Chemical Society ACS officially followed aluminum in 1925, however in 1990 The International Union of Pure and implemented Chemistry IUPAC regularly occurring aluminum as a worldwide fashionable. And so we land today: with aluminum used by the English speakers of North us, and aluminum used anywhere else.
The most comforting part of this tale is that both Aluminum and Aluminium are conventional and correct. Aluminum is preferred in North the us, while Aluminium is the spelling favored within the united kingdom and most different English-talking countries.
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Describe how solar radiation and convection currents work together to form weather patterns and help plants grow.
MAN I ACTUALLY DO NOT KNOW THIS SH
Solar radiation and convection currents work together to form weather patterns because the plants need sun, water, and damp soil for photosynthesis.
What is Photosynthesis?This is referred to as the process in which green plants manufacture their food in the presence of sunlight. The green pigment in plants which is known as chlorophyll is responsible fir the trapping of sunlight which helps provide the energy needed for the reaction.
Solar radiation and convection currents help in the formation of weather patterns because the area which is facing the sun is said to be experiencing summer and vice versa.
They also help plants grow by providing the plants with resource such as the sun, water, and damp soil etc which are needed for photosynthesis.
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at a given temperature, the vapor pressures of hexane and toluene are 183 mm hg and 59.2 mm hg, respectively. calculate the total vapor pressure over a solution of hexane and toluene. the mole fraction of hexane (x hexane) is 0.520.
Answer:
total of 131 millimeters of mercury
Explanation:
So we can calculate the total vapour pressure using the equation. The total pressure p equals x a where x is the mole fraction of a and the p a is the partial pressure of a plus x b being the mule fraction of b and the partial pressure of b we can get the mule fraction of a and B because 1 will equal x, a plus x b and a is hexane and b is octane, and so the mole fraction of hexane is 1.580, and so we can set this up to solve. As x b will equal 1 minus x a which is equal to 1 minus .58, which is equal to .4 2 point now, because we have all our numbers, we can put them into our full equation. So we have. The pressure is equal to .58 times. The pressure of our hexane, which is greater than 183, and this has added 2.42 and the pressure of our octane, which is 59.2, and so we get a total of 131 millimeters of mercury. As our total vapour pressure.
answer is in th epic
hydrogen gas is produced by the reaction between metallic aluminum and aqueous hydrochloric acid. 2al(s) 6hcl(aq)⟶2alcl3(aq) 3h2(g) the hydrogen gas produced by this reaction is typically collected via water displacement. during this process, the hydrogen gas becomes saturated with water vapor. if 292.6 ml of gas with a total pressure of 1.44 atm is collected via water displacement at 29.4 ∘c , what is the partial pressure of the hydrogen gas in the sample? the vapor pressure of water at 29.4 ∘c is 30.75 torr. Ph2
(a) - 1.39 atm is the partial pressure of the hydrogen gas in the sample
(b) - 0.219 g many grams of aluminum must have reached to produce this quantity of hydrogen gas.
What exactly is the partial pressure law?According to Dalton's Law, often known as the Legislation of Partial Pressures, the combined pressure of a mix of gas is equal to the product of their individual partial pressures.
Briefing:(a)The partial pressure of hydrogen gas and the vapour pressure of water are added to determine the total pressure of the gas mixture.
PT = Pw + PH
Water has a vapour pressure of atm.
Pw = (30.75 torr)(1.00 atm) / 760 torr
Pw = 0.0405 atm
The hydrogen gas pressure is
PH = PT - Pw
PH = 1.44 atm - 0.0405 atm
PH = 1.39 atm
(b) The amount of hydrogen gas in moles is
n = PV / RT
n = (1.39 atm) (0.2384 L) / 0.82057 atm L / mol K (302.6 K)
n=0.0122 mol
Aluminum metal and hydrogen gas have a 3:2 molar ratio. The required amount of aluminum metal in moles is
n=0.0122 mol * 2 / 3
n = 0.00813 mol
Aluminum has a molar mass of 26.981538 g/mol. The quantity of aluminum needed is
m = 0.00813 * 26.981538 g/mol
m = 0.219 g
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The complete question is -
Hydrogen gas is produced by the reaction between metallic aluminum and aqueous hydrochloric acid. 2al(s) 6hcl(aq)⟶2alcl3(aq) 3h2(g)
(a)the hydrogen gas produced by this reaction is typically collected via water displacement. during this process, the hydrogen gas becomes saturated with water vapor. if 292.6 ml of gas with a total pressure of 1.44 atm is collected via water displacement at 29.4 ∘c , what is the partial pressure of the hydrogen gas in the sample?
(b)How many grams of aluminum must have reached to produce this quantity of hydrogen gas ? The vapor pressure of water at 29.4 ∘c is 30.75 torr.
pre-lab questions: what are the properties of ionic compounds? what are the properties of covalent compounds? which type of compound is salt? which type of compound is sugar?
The properties of the compounds are given as following:
The physical properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.The physical properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.Sugar is classified under covalent compound.Covalent compound
The atoms of covalent compounds are bonded between each other by covalent bonds. Covalent compounds make bonds by sharing one or more pairs of valence electrons.
Ionic compound
The atoms of ionic compound contains ions or charged particles. ionic compounds make bonds when an atom or more atoms lose or gain electrons.
Thus, the properties of compounds are:
The physical properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.The physical properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.Sugar is considered as a covalent compound.Learn more about properties of compounds from the link given below.
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a drop in water temperature is observed when 0.873 g of ammonium nitrate is added. the enthalpy change for this reaction is 0.280 kj. which of the statements is accurate?
The most accurate statement to explain the phenomena would be that the enthalpy change being positive means that the reaction is endothermic.
What are endothermic reactions?Endothermic reactions are reactions in which the energy level of the reactants is lower than the energy level of the products of the reaction. In other words, exothermic reactions take energy from the surroundings rather than releasing energy to the surroundings.
Reactions that release energy to the surroundings are otherwise known as exothermic reactions. Here, the reactants are usually at a higher energy level than the products.
When it comes to enthalpy change, since endothermic reactions consume energy from the surroundings and the products are usually at a higher energy level, the enthalpy change is positive.
This is unlike exothermic reactions in which the enthalpy change is negative because heat is released into the surroundings instead.
Thus, the dissolution of ammonium nitrate in water is said to be endothermic because the enthalpy change is positive.
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at what point in the lab was the tetra-n-butylammonium bromide, tbab, removed from the reaction mixture?
At 102°C - 106°C tetra-n-butylammonium bromide, tbab, is removed from the reaction mixture.
Facts about tetra-n-butylammonium bromide or TBAB
Crude solid suspension in warm hexanes removes the impurities from it and performing gravity filtration dries it.1H NMR spectra of starting material shows 4 benzene ring hydrogens at around 7 ppm. But in product spectra there are two benzene rings 5 hydrogen's peaks are present.TBAB is removed from the reaction mixture by dissolving the solid in Ethyl acetate and washing the organic layer with water to separate TBAB. After water wash dried the organic layer with anhydrous sodium sulfate and evaporate the organic layer under reduced pressure to get pure compound.Learn more about TBAB from the link given below.
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What kind of energy can travel through empty space without being carried in or by any matter?
A.
sound
B.
mechanical
C.
light
D.
all of these
The energy can travel through empty space without being carried in or by any matter is light.
What is light?
light is an electromagnetic wave and it can travel through a vacuum such as the empty parts of outer space. electromagnetic wave means it has both the proprties of electric field and magnetic field. In a model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and light.
What is the travelling speed of light?
In empty space, light travels at a speed of about 300,000 km/s. It does not require any substance or material to transport its energy. This means that light can pass across a vacuum—a place devoid of any air.
The energy can travel through empty space without being carried in or by any matter is light.
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Which of the following is true of zinc?
a. Grains are the most reliable food sources of zinc.
b. Excess zinc can decrease copper absorption.
c. All of its functions involve it acting as a cofactor for enzymes.
d. It binds to most proteins in the body.
The true statement about zinc is b. Excess zinc can decrease copper absorption.
Zinc is a trace elements or a micronutrient. It means it is required in low amounts to the body. It is also an essential element required by the body. We intake zinc through diet, form the vegetables and fruits, stating their importance in diet.
The body receives around 20 to 40% of the zinc from the food. Calcium is also a trace essential element required by the body. Several studies intake decrease in copper absorption on excess zinc. Calcium is required for vitamin D synthesis and bones. Zinc is required for better metabolism, immune system through enzyme function.
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Draw the following five compounds and compile them in a Microsoft Word document or PDF. Make sure to label each drawing clearly. Once done, upload your finished file.
2-butene
2-hexyne
2-pentene
1-pentene
1-heptyne
The discrete interactions in a system are conceptually represented by finite state machines (FSM) and petri nets (PN).
What are the isomers of 2-butene?Isomeric forms are 1-butene, cis-2-butene, trans-2-butene, and isobutylene. The butyne chemical formula is C4H6 C 4 H 6 .Butyne has two structural isomers, which are compounds with the same chemical formula but different structural formulas. The C4H6 C 4 H 6 isomers are: 1-Butyne, which is an isomer whose C≡C C ≡ C bond is initiating at carbon 1.1-Hexyne is used in the preparation of tricyclic is indolinone scaffold by undergoing hydrozirconation and ring-closing metathesis. It is used to prepare trans-1,2-bis(5-thianthreniumyl)alkene tetrafluoroborate by reacting with thianthrene cation radical tetrafluoroborate.C4H8
One of the mathematical modeling languages for the description of distributed systems is the Petri net, often known as a place/transition (PT) net. It belongs to the discrete event dynamic system class. A Petri net is a directed bipartite graph with locations and transitions as its two types of members. White circles are used to represent place elements, whereas rectangles are used to represent transition elements.Tokens, which are represented as black circles, can be found anywhere. If at least one token is present at every site connected to a transition as an input, the transition is enabled. According to some sources[1], Carl Adam Petri created Petri nets in August 1939 when he was just 13 years old in order to describe chemical reactions.To learn more about Microsoft word document refer to:
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what product(s) is/are obtained when ethyne is treated with kmno/h ? question 7 options: aldehyde and ketone 2 moles of co2 ketone and ether two carboxylic acids
When ethyne or acetylene reacts with cold KMnO₄, the triple bond gains 4 OH. Oxalic acid is produced when it is oxidized by a diluted dilute solution of potassium permanganate.
What results from burning ethyne?Incomplete combustion of ethanol produces carbon dioxide, carbon monoxide, and water vapor. Ethyne (acetylene) now emits a sooty flame when burned in air. This is because there isn't enough oxygen in the air to melting metals for metals, which leads to incomplete combustion.
Is acetylene the same as ethyne?Acetylene, also known as ethyne, is the most basic and well-known constituent of the hydrocarbons series known as the acetylenic sequence, or alkynes, which has zero maybe more pairs of carbons joined by triple bonds.
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balance the following redox reaction if it occurs in acidic solution. what are the coefficients in front of ni and h+ in the balanced reaction? ni2+(aq) + nh4+(aq) → ni(s) + no3-(aq) balance the following redox reaction if it occurs in acidic solution. what are the coefficients in front of ni and h+ in the balanced reaction? ni2+(aq) + nh4+(aq) → ni(s) + no3-(aq) ni = 4, h+ = 10 ni = 2, h+ = 4 ni = 1, h+ = 8 ni = 1, h+ = 4 ni = 3, h+ = 5
The coefficients before Ni and H+ are 4 and 10 respectively.
A coefficient is an integer that is written or multiplied by a variable. A quantitative value multiplies variables and can change depending on other variables or covariates. Function coefficients are different from other coefficients in that they are constant across all entities or participants, while others can vary.
Coefficients are multiplicative coefficients in terms of a polynomial series, or expression. Usually numeric, but can be any expression. If the coefficients themselves are variables they can also be called parameters. Circle the variable with the power of the coefficient you found. Leave that variable and consider any other number or variable written to it. that will be the coefficient.
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how many grams of nh4cl can be dissolved in 100.0 ml of h2o at 10°c? at 100°c? you will need to extrapolate from the experimental curve (that is, extend the lines below and above the experimental segment).
We can get the solubility at temperatures from this experimental curve. we can find the solubility at 10∘C and 100∘C temperature. Hence, NH4Cl can be dissolved in 100 mL of H2O at 10∘C is 34g and at 100∘C is 75g.
Why is NH4Cl so easily dissolved in water?Answer and justification Salt made from ammonia and chlorine gas is known as ammonium chloride. It is a salt of strong acid (HCl) and weak base (NH4OH) (N H 4 O H). Although the process is endothermic, meaning it requires a temperature increase, the ammonium chloride salt is soluble in water.
What exactly do the terms saturated, unsaturated, and supersaturated mean?Saline Solution.a mixture in which the solute dissolves until it is no longer able to do so, leaving the undissolved components at the bottom. Solution without saturation. a solution that totally dissolves and leaves no residues (but contains less solute than the saturated solution). Solution with a high saturation.
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a compound that has 5 electron groups, 4 bonding pairs and 1 lone pair is considered to have a molecular geometry.
The compound will show pentagonal pyramidal structure.
This is because the one axial plane is occupied by the lone pair of electrons obeying the bent's rule . And the other 4 bond pairs are present in both equatorial and the axial position. Since a lone pair of electrons are present they represent pentagonal bipyramidal structure to pentagonal pyramidal structure.
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