1.6987 grams the silver nitrate crystals is weighed, 100 mL of water is measured, and the weighed silver nitrate is dissolved in the measured amount of water.
Solution preparationWe are to prepare a 0.1 M silver nitrate solution given the following:
Crystals of silver nitrateClean and dry volumetric flaskDeionized waterWeighing balanceFirst, we need to make some calculations to make the amount of silver nitrate and water that will be used.
0.1 M means 0.1 mol silver nitrate crystal in 1 L of water. However, we only have a 100 mL volumetric flask. We need to know the mol amount that will be equivalent to 100 mL of water.
0.1 mol = 1000 mL
100 mL = 100 x 0.1/1000
= 0.01 mol
Mole = mass/molar mass
Molar mass of silver nitrate = 169.87 g/mol
0.01 mol silver nitrate = 0.01 x 169.87
= 1.6987 grams
Thus, 1.6987 grams of silver nitrate would be weighed.
The following steps would be taken to prepare the solution:
Weigh out 1.6987 grams of the silver nitrate crystals.Measure out 100 mL of the deionized water using the volumetric flask.Dissolve the weighed silver nitrate into the measured waterWhat you will have is 100 mL of 0.1 M silver nitrate solution.
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18.00 g hydrated magnesium
sulfate is heated to drive off the
water, leaving 9.211 g MgSO4 solid.
What is the formula of the hydrate?
The formula of the hydrate would be [tex]MgSO_4.6H_2O[/tex].
Deducing the formula of a hydrate saltIn order to get the formula of the hydrated salt, the empirical formula method can be used to know the mole of the salt and that of the water.
The formula of magnesium sulfate = [tex]MgSO_4[/tex]
The formula of water = [tex]H_2O[/tex]
Mass of hydrated magnesium sulfate = 18.00 g
Mass of anhydrous magnesium salt = 9.211g
Mass of water = 18 - 9.211
= 8.789 g
Now, let's find the mole equivalent of each component:
Molar mass of magnesium sulfate = 120.366 a/mol
Molar mass of water = 18.01 g/mol
Mole of magnesium sulfate anhydrous = 9.211/120.366
= 0.0765 mole
Mole of water = 8.789/18.01
= 0.4880 mole
Now, let's divide by the lowest mole:
Magnesium sulfate = 0.0765/0.0765
= 1
Water = 0.4880/0.0765
= 6.37
Thus, the mole ratio of magnesium sulfate and water of hydrate is 6 to 1. Therefore, the formula of the hydrated salt would be [tex]MgSO_4.6H_2O[/tex].
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An element from Group 13 bonds with an element from Group 17. Which formula correctly depicts the correct chemical formula for elements from these two groups?A AlCl3AlCl 3 B BFBF C BrGa3BrGa 3 D B3I
When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from group 13 elements and group 17 is AlCl₃.
What is chemical formula?
Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state. the compound that will be formed from group 13 elements and group 17 is AlCl₃.
Therefore, the correct option is option A.
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e)
Calcium hydroxide reacts with carbon dioxide to reform calcium carbonate.
Ca(OH)₂ (aq) + CO₂(g) → CaCO3 (s) + H₂O(l)
(i)
Determine the mass, in g, of CaCO3 (s) produced by reacting 2.41 dm³ of
2.33 x 10-2 moldm-3 of Ca(OH)₂ (aq) with 0.750 dm³ of CO₂ (g) at STP.
The mass of Ca CO₃ produced by reacting 2.41 dm³ of 2.33 x 10-2 mol dm-3 of Ca(OH)₂ (aq) with 0.750 dm³ of CO₂ (g) at STP is 30353 g.
What is STP?The nominal atmospheric conditions at sea level are referred to as "standard temperature and pressure" (STP). The temperature and pressure are both zero degrees Celsius (atm). The STP value is crucial for many professionals, including physicists, chemists, engineers, pilots, and navigators.
1 dm³ = 1L
2.41 dm³=2.41 L
Moles of Ca(OH)₂ = m M. vol (L)
= 2.33×10⁻²m ×2.41 =5.6153 10⁻²Mol
Moles of CO₂ (n) = [tex]\frac{PV}{RT}[/tex] = [tex]\frac{(1 atm) . (0.75L)}{(0.032).(1atm).(273k)x^{2} k^{-1} ml}[/tex]
Moles of CO₂ (n) = 0.0335 mol
Ca(OH)₂ + CO₂ ⇒ Ca CO₃ + H₂O
[tex]I_{mol}[/tex] 5.6153×10⁻² 0.0335mol 0
C 0.0335mol -0.0335mol 0.0335mol
⇒ 0.022653 0 0.0335mol
Mass of Ca CO₃ = Moles × Molar mass
Mass of Ca CO₃ = 0.0335 mol ×100.0869 g/mol
Mass of Ca CO₃ = 30353 g
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Which substance (Na, Mg, or Ca) do you identify with and why?
The metals known as Alkaline Earth metals are Na, Mg, or Ca. They are known as "alkaline" earth metals because when they interact with water, they produce "alkaline" hydroxides solutions.
How many metals made of alkaline earth exist?Any of the six chemical elements that make up Group 2 (II a) of the periodic table is an alkaline-earth metal. Beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium are the constituent elements (Ra).
What other names do alkaline earth metals go by?The alkaline earth oxides, formerly known as beryllia, magnesia, lime, strontium, and baryta, are what give the alkaline earth metals their name. These oxides turn basic when combined with water (alkaline).
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The bond enthalpy of F2(g) is 156.9 kJ/mol. Calculate ΔH o f for F(g).
The bond enthalpy of F2(g) is 156.9 kJ/mole. The ΔH o f for F(g) is 78.5 kJ/ mole.
What is bond enthalpy?Bond enthalpy is defined as the amount of energy needed to dissolve one mole of a certain type of bond between two gaseous atoms. In general, the amount of energy acquired or lost during a reaction is comparable to the process's change in enthalpy.
Given the bond enthalpy of F2 = 156.9 kJ/ mole
The ΔH can be calculated as
ΔH = bond enthalpy of F2 / 2
ΔH = 156.9 kJ/mole / 2
ΔH = 78.5 kJ/mole
Thus, the bond enthalpy of F2(g) is 156.9 kJ/mole. The ΔH o f for F(g) is 78.5 kJ/ mole.
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Which of the following is involved in bonding between atoms?
Select one:
O a. neutrons
O b. protons
O c. electrons
O d. the nucleus
The following is involved in bonding between atoms is electron
There are four type of chemical bonds essential for life to exist and it is ionic bond, covalent bond, hydrogen bond, and Vander wall interaction and all of these are different kind of bond to play various role in biochemical interaction and the electron on the outermost energy level of the atom are called valence electron and the valence electron are involved in bonding one atom yo another
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How many electronic under layers are there on level n=7?
The seventh shell contains 49 orbitals, making the total number of electrons in 49 orbitals 98.
How do Group 7 elements appear?characteristics of elements in group 7
At room temperature, each halogen exhibits the properties listed below: A light yellow gas is fluorine. A deadly green gas, chlorine is poisonous. The reddish-brown liquid bromine is poisonous.
Since the group number is 7, this means that the outer shell of halogen atoms contains seven electrons (energy level). These atoms gain a single electron in order to stabilize themselves and adopt the same structure as the nearby noble gas (rather than losing seven electrons which would take much more energy).
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What is unique about the orbitals around the nucleus of an atom?
Responses
Each orbital has its own set of neutrons.
Each orbital has its own set of neutrons.
Each orbital has electrons of a specific energy level.
Each orbital has electrons of a specific energy level.
Each orbital contain protons.
Each orbital contain protons.
Each orbital has only one electron.
The unique property of the orbitals around the nucleus of an atom is that each orbital has electrons of a specific energy level; option B.
What are orbitals in an atom?Orbitals in an atom are regions of space around which electrons are found in an atom.
The orbitals in an atom are also described as energy levels.
Electrons are arranged in atomic orbitals from orbitals having the lowest energy to orbitals having the greatest energy.
The outermost orbital of an atom is known as the valence orbital and electrons found there are known as valence electrons.
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Communities often have disposal sites where people can safely dispose of medications, household cleaners and waste instead of pouring them down their sink drains.
How does this impact the environment?
reduces water pollution
reduces waste recycling
improves land conservation
reduces fossil fuel consumption
Having disposal sites where people can safely dispose of medications, household cleaners and waste instead of pouring them down their sink drains impacts the environment by reducing water pollution.
What is water pollution?
When chemicals contaminate water sources, the water in these water bodies becomes unsafe and harmful for use in drinking, cooking, cleaning, swimming, and other activities. This contamination of water bodies is called water pollution.Chemicals, waste, microorganisms, and parasites are examples of pollutants affecting the water bodies.Pouring chemicals down the drain poses the most immediate risk of water pollution. Chemicals are harmful for consumption by all living things when they are dumped down the drain because of the effects they have on our rivers, lakes, streams, and other water supplies.
In regions where contamination is happening, human health might suffer, which can cause serious health problems. Animals and plants that are given contaminated water get sick and die, which has an impact on agriculture as well.
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If a sulfuric acid (H₂SO₄, MM = 98.09 g/mol) solution is completely neutralized with 61.37 mL of the NaOH solution above what was the mass in grams of sulfuric acid in the solution. Remember, you need a balanced chemical reaction for stoichiometry. (do not forget about SF)
Assuming the concentration of the NaOH solution that reacted with the sulfuric acid is 1.0 M, the mass of the sulfuric acid that reacted is 3.01 g.
What is a neutralization reaction?A neutralization reaction is a reaction in which an acid reacts with a base to form salt and water only.
In the given reaction, a given amount of sulfuric acid was neutralized by 61.37 m:L of a NaOH solution.
The equation of the neutralization reaction is given below:
2 NaOH (aq) + H₂SO₄ (aq) ----> Na₂SO₄ (aq) + 2 H₂O (l)
The mole ratio of the reaction shows that 2 moles of NaOH solution will react with 1 mole of H₂SO₄ solution.
The moles of NaOH reacting = concentration * volume in liters
The concentration of the NaOH solution is not given. Assuming the concentration of the NaOH solution is 1.0 M
Moles of NaOH reacted = 1.0 * 61.37 mL * 1 L / 1000 mL
Moles of NaOH reacted = 0.06137 moles
Moles of H₂SO₄ reacted = 0.0614 / 2
Moles of H₂SO₄ reacted = 0.0307 moles
Mass of H₂SO₄ reacted = 0.0307 * 98.09
Mass of H₂SO₄ reacted = 3.01 g
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you have a sample containing 4.5g of an unknown gas. Based on the volume, temperature, and pressure of the sample, there are 0.14 moles of gas present. What is the molar mass (g/mol) of the unknown gas? please explain step by step
The molar mass of the gas is obtained as 32.1 g/mol.
What is the molar mass?The molar mass has to do with the mass one mole of a substance. We know that according to the question, we can be able to obtain the number of moles of the compound from the ideal gas equation.
This is how we are able to get the number of moles of the gas as 0.14 moles. Now we need to use the information that we have to get the molar mass of the gass.
Number of moles = mass/ molar mass
Molar mass = mass/Number of moles
Molar mass = 4.5g/0.14 moles
= 32.1 g/mol
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Which of the following is the correct formula to calculate percent by mass? [Mass of solution (g) + mass of solute (g)] × 100 [Mass of solute (g) − mass of solution (g)] × 100 [Mass of solute (g) ÷ mass of solution (g)] × 100 [Mass of solution (g) ÷ mass of solute (g)] × 100
Considering the definition of percent by mass, the correct answer is the third option: the correct formula to calculate percent by mass is [Mass of solute (g) ÷ mass of solution (g)] × 100
Definition of percent by massThe percent by mass is a measure of the amount of mass that an element occupies in a compound and it is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.
So, the percent by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:
percent by mass= [Mass of solute (g) ÷ mass of solution (g)] × 100
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How do scientists predict how much of a product can be formed?
The way that scientists predict how much of a product can be formed is through the use of Stoichiometry.
What is Stoichiometry?The quantitative examination of the constituents of a chemical process is known as chemical stoichiometry. The Greek words "stoikhein" (which means element) and "metron" (which means measure) are the roots of the English word "stoichiometry."
Stoichiometry describes the correlation between the amounts of reactants and products before to, during, and after chemical processes.
Therefore, the quantity of the generated good is predicted by stoichiometry. To calculate how many S'more "reactants," for instance, we employed stoichiometry.
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How is a tornado different from a hurricane
A. A tornado causes less damage to an ecosystem
B. A tornado brings more rain
C. A tornado is much smaller
D. Hurricanes do not impact life on land
Answer: C. A tornado is much smaller
Explanation: A tornado can be a mile long while hurricanes can be 50 miles long.
The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 × 10−5 m2/s and 253,300 J/mol, respectively. At what temperature will the diffusion coefficient have a value of 2.1 × 10−14 m2/s?
The temperature is obtained as 1517 K.
What is the temperature?We know that we asked here to find the temperature at which we are going to have a diffusion coefficient of 2.1 × 10−14 m2/s. Let us look at the following from the question;
D = diffusion coefficient = 2.1 × 10−14 m2/s
[tex]D_{o}[/tex] = pre-exponential constant = 1.1 × 10−5 m2/s
[tex]E_{a}[/tex] = Activation energy = 253,300 J/mol
R = Gas constant = 8.314 J/mol.K
T = temperature = ??
Then;
log D= log [tex]D_{o}[/tex] - Ea/2.303RT
log(2.1 × 10−14) = log( 1.1 × 10−5) - 253,300/2.303 * 8.314 * T
log(2.1 × 10−14) / log( 1.1 × 10−5) = - 253,300/2.303 * 8.314 * T
T = - 253,300/-8.719 * 2.303 * 8.314
T= 1517 K
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An ideal gas sample has a certain volume at 350 K and 1 atm. The volume of the
same sample at STP will be closest to the volume at 350 K and 1 atm multiplied by:
A. 350/273
B. 350/298
C. 298/350
D. 273/350
From the general gas equation, the volume of the same sample of gas at STP will be closest to the volume at 350 K and 1 atm multiplied by 273/350; option D.
What is the relationship between the volume, temperature, and pressure of a gas?The relationship between the volume, temperature, and pressure of a gas is given by the general gas equation below:
P₁V₁ / T₁ = P₂V₂ / T₂
Where;
P₁ = initial pressure
V₁ = initial volume
T₁ = initial temperature
P₂ = final pressure
V₂ = final volume
T₂ = final temperature
Solving for V₂;
V₂ = P₁V₁T₂ / P₂T₁
V₂ = 350 * 1 * 273/350
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nasa measured the frequency of a cosmic ray emission to be 2.3 x 10^24 Hz. what is the wavelength in nm of this cosmic ray
The wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.
What is wavelength?
Wavelength in a wave is the distance between any given point on a wave and the same point on the adjacent wave that is crest to crest or trough to trough. It can be measured in the direction of the given wave.
The wavelength in nm of the cosmic ray can be calculated as,
λ = c / ν
where λ is the wavelength, ν is frequency in Hz or s^-1 and c is velocity of light.
λ = (3 x 10^8 m/s) / 2.3 x 10^24 Hz = 1.304 x 10^-16 m = 1.304 x 10^-7 nm.
Therefore, the wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.
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how did the scientist explain the relationship beetween the colors observed and the structure of the atom
Answer:
The colors observed is a sign that definite energy transformations occurs inside the atom gives off light. It follows that electrons must occupy orbits of fixed energy.
Hope that helps!
What is the pH of a solution that is 0.21 M sodium fluoride and 0.57 M hydrofluoric acid?
From the Henderson- Hasselbalch equation, the pH of a solution is 3.36.
How can the pH of a solution made from a weak acid and its conjugate base be calculated?The pH of a solution made from a weak acid and its conjugate base can be calculated using the Henderson- Hasselbalch equation.
The Henderson- Hasselbalch equation is given below as follows:
pH = pKₐ + log ([A⁻]/[HA])where;
pKa = - log(Ka) of hydrofluoric acid[A⁻] = concentration of salt of conjugate base, NaF[HA] = concentration of hydrofluoric acidpKa of HF = 3.8
[A⁻] = 0.21 M
[HA] = 0.57 M
pH = 3.8 + log (0.21/0.57)
pH = 3.36
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what is the limiting agent in 3 C2H3O2H + Al(OH)3
To solve such this we must know the concept of chemical reaction and concept of limiting agent. Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting agent in the given balanced equation.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The balanced reaction is
3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H + Al(OH)[tex]_3[/tex][tex]\rightarrow[/tex]
The limiting reagent depends on the mole ratio and not on the masses of the reactants present. 1 mole of Al(OH)[tex]_3[/tex] need 3 moles of 3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H. So, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.
Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.
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Hydrogenation of cholesterol
The molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.
What is cholesterol?
Any member of the lipids class of specific chemical compounds is a kind of cholesterol. It is a sterol, a class of lipid (or modified steroid). All animal cells produce cholesterol, which is a crucial part of the membranes that make up those cells. It is a yellowish crystalline solid when chemically separated. It is possible to increase the saturation of fatty acids by adding hydrogen to unsaturated fatty acid chains, which connects the hydrogen atoms to the saturation sites.
Hence, the molecular structure of the fat is changed when lipids like cholesterol are exposed to hydrogenation.
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What is the Internal Energy of a Human Body? Define internal energy as Delta E.
SHOW ALL WORK!
20 points
The internal energy of a human body is the net energy contained in the body due motion of its particle or molecules.
In a human body the internal energy is stored . It increases when the temperature of the body rises, or when the body observes some changes. Internal energy we can say that is the sum of kinetic and potential energy of all particles in the body.
Internal energy is a state function of a system and is an extensive quantity. Every substance possesses a fixed quantity of energy which depends upon its chemical nature and also on its state of existence. Every substance have a definite value of Internal energy.
The change in the Internal energy of a reaction may be considered as the difference between the internal energies of the two states.
ΔU = [tex]E_{B}[/tex] - [tex]E_{A}[/tex] where [tex]E_{B}[/tex] and [tex]E_{A}[/tex] are the initial energies of states A and B. Or we can also write the equation as:
ΔU = ΔE
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How much heat is released when an acetylene (C2H2) torch burns 250 grams of fuel? (ΔH of combustion for acetylene = -1300 kJ/mol)
Select one:
135 kJ
32500 kJ
12500kJ
5.2 kJ
12500 joule heat is released when an acetylene (C2H2) torch burns 250 grams of fuel
q=ΔnH
H acetylene = -1300 kJ/mo
n=given mass/molar mass
given mass= 250 g
molar mass=26
n= 250/26
n=9.61
q=ΔnH
q=9.61× -1300 kJ/mo
q=-12500 joule
In thermodynamics, heat has a very specific definition that is different from how we generally use the word. When two systems with various surface temperatures come into touch with one another, heat is the thermal energy that is transferred. The letters q or Q stand for heat, which is measured in joules.
Heat is sometimes referred to as a process quantity since it is defined in the context of a process through which energy can be conveyed. We may talk about the heat that a hot cup of coffee imparts to your hand, but we don't talk about the heat that a cup of coffee itself holds. Heat is yet another noteworthy quality.
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How many grams of propane can combust at 25°C and 1.04 atm if reacting with 14.7 L of oxygen gas?
The volume of oxygen is 14.7 litres.
What is volume?
volume is a measure of occupied three dimensional space.
Sol-Balanced chemical reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.
m(C₃H₈-propane) = 5.53 g.
n(C₃H₈) = m(C₃H₈) ÷ M(C₃H₈).
n(C₃H₈) = 5.53 g ÷ 44.1 g/mol.
n(C₃H₈) = 0.125 mol.
From chemical reaction: n(C₃H₈) : n(O₂) = 1 : 5.
n(O₂) = 0.625 mol.
T = 25° = 298.15K.
p = 1.04 atm.
R = 0.08206 L·atm/mol·K.
Ideal gas law: p·V = n·R·T .
V(O₂) = n·R·T / p.
V(O₂) = 0.625 mol · 0.08206 L·atm/mol·K · 298.15 K / 1.04 atm.
V(O₂) = 14.7 L.
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What would 5 carbons, 3 chlorine group side chains, and one propyl group side chain look like?
The structure of the compound that have been described in the question is shown in the image attached to this answer.
What is the structure?We know that in organic chemistry, the structure of a molecule is very instrumental to the way that the molecule would be able to undergo reaction. In this case, we have a compound that is said to have 5 carbons, 3 chlorine group side chains, and one propyl group side chain.
Our key task is first to visualize the molecule and they try to create the structure of the molecule. As we try to create the structure of the molecule, we must have in mind the tetravalence of carbon. That is, carbon can only form four bonds to itself.
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The reaction of 50 mL of gas with 150 mL of gas to form ammonia via the equation:
N (g) + 3H (g) -----> 2NH (g)
will produce __________ mL of ammonia if pressure and temperature are kept
At constant temperature and pressure, 100mL of ammonia will be produced.
What is ammonia?Ammonia is described as an inorganic compound of nitrogen and hydrogen with the formula NH₃. It is a stable binary hydride, and the simplest pnictogen hydride, ammonia is a colorless gas with a distinct pungent smell.
Gay-Lussac's law of combining volumes states that the volume of gases which take part in a chemical reaction bear a simple whole number ratio to one another and to the volume of products if gaseous, when measured at constant temperature and pressure.
According to the Equation of reaction: N₂(g) + 3H₂(g) ----> 2NH₃(g)
From the equation of reaction given above,
1 mole of nitrogen gas reacts with 3 moles of hydrogen to produce 2 moles of ammonia. Therefore,
50 mL of nitrogen will react to produce produce 2 * 50 mL of ammonia = 100ml of ammonia
Also, 150mL of hydrogen will react to produce 2 *150mL/3 of ammonia = 100ml of ammonia.
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23. When wood burns, only a small amount of ashes are made. We know that matter cannot be created or
destroyed. Explain why the mass of the wood before the fire does not equal the mass of the ashes after the
reaction.
for each
The mass of wood before burning does not always equal the mass of the resulting ashes after burning because some other products have been produced and lost.
Burning of woodWhen wood burns, a form of chemical change takes place and the reaction is reversible.
The products of wood burning include ashes, carbon dioxide, and water vapor. However, only ashes remain after burning because carbon dioxide and water vapor both escape into the atmosphere.
The escape of some of the products of burning into the atmosphere is one of the reasons the reaction seems to negate the law of conservation of mass.
According to the law of conservation of mass, masses are conserved during reactions but can be converted to different forms. Thus, if ashes were to be the only product of the burning of wood, then the mass of the ashes formed must be equivalent to the mass of the wood.
However, due to the formation of other products that happen to always escape into the air, the mass of ashes is not always equal to the mass of the woods that burn.
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What is the physical state of caesium at 25 degrees?
Answer:
298k
Explanation:
because 298k is lower than 302k
A wave's frequency is 8.50x10^14 s-1. What is the wavelength?
Based on the given frequency of the wave, the wavelength of the wave is 3.75 * 10⁻⁷ m.
What is the relationship between the frequency and wavelength of a wave?The frequency of a wave is the number of complete oscillations performed by the wave per second.
The wavelength is the distance between successive points on the wave.
The relationship between the wavelength and frequency of a wave is given below:
Wavelength = velocity / frequency
Assuming the given wave is an electromagnetic wave, the velocity of the wave is 3.0 * 10⁸ m/s
Wavelength = 3.0 * 10⁸ m/s / 8.50 * 10¹⁴ s⁻¹
Wavelength = 3.75 * 10⁻⁷ m
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Acetylsalicylic acid, C9H8O4, is the pain reliever in many
headache medications. A typical tablet contains 250.0 mg
of acetylsalicylic acid.
(a) Calculate the amount of acetylsalicylic acid in the tablet.
(b) Calculate the number of hydrogen atoms in the amount
of acetylsalicylic acid in the tablet determined in (a).
The amount of acetylsalicylic acid in the tablet is 0.001389 moles and the number of hydrogen atoms in the amount of acetylsalicylic acid in the tablet is 6.69 × 10²¹.
(a)
The formula of acetylsalicylic acid is C₉H₈O₄.
Molar mass of C₉H₈O₄ = 9 × atomic mass of C + 8 × atomic mass of H + 4 × atomic mass of O
= 9 × 12 + 8 × 1 + 4 × 16
= 108 + 8 + 64
= 180
No of moles of acetylsalicylic acid = Given mass / molar mass
= 0.25 / 180
= 0.001389
Hence, the number of moles of acetylsalicylic acid is 0.001389 moles.
(b)
Number of hydrogen atoms present in 1 mole of acetylsalicylic acid = 6.023 × 10²³ atoms
Number of hydrogen atom present in 0.001389 moles of acetylsalicylic acid = 0.001389 × 6.023 × 10²³ = 0.008365 = 8.36 × 10²⁰ atoms.
Now there are 8 hydrogen atoms in acetylsalicylic acid so,
Number of atoms of hydrogen in acetylsalicylic acid = 8 × 8.36 × 10²⁰ atoms = 6.69 × 10²¹ atoms.
Hence, the number of atoms of hydrogen in 0.001389 moles of acetylsalicylic acid is 6.69 × 10²¹ atoms.
Learn more about number of atoms from the link given below.
https://brainly.com/question/496549
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