When cloudy appearensce or turbidity appear in the solution, it shows that there is a precipitation and this compound is not dissolve in solvent. Here the compound settle down to thebottom of test tube so it is insoluble.
A substance is remember which has a particular composition and precise homes. every natural element is a substance. every natural compound is a substance. Examples of substances: Iron is an element and subsequently is likewise a substance. Methane is a compound and consequently is likewise a substance.
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Disclaimer:- Your question is incomplete, please see below for the complete question.
A novice scientist would like to test the solubility of an unknown compound. she adds a known amount of the compound to a test tube that holds 10 ml of water. she swirls the solution, mixing the substances together and places the test tube in a rack. a cloudy film begins to form near the bottom of the test tube. one possible conclusion might be that .
A. The compound miscible in water.
B. The compound is insoluble in water.
C. The compound is polar
D. The compound is unsaturated.
Write a nuclear equation to describe the spontaneous fission of 243 95am to form i-134 and mo-107. Determine how many neutrons are produced in the reaction.
Following is the nuclear equation for the spontaneous fission of ₉₅Am²⁴3 , which results in the formation of ₅₃I¹³⁴ + ₄₂Mo¹⁰⁷ and three neutrons:
₉₅ Am²⁴3 -----> ₅₃I¹³⁴ + ₄₂Mo¹⁰⁷ + 3 ₀n¹
What is neutrons?The neutron is a subatomic particle that has a neutral charge, the sign n or n0, and only a little bit more mass than a proton. The atom's nucleus is made up of protons and neutrons. All other nuclei require neutrons to remain stable, with the exception of the hydrogen atom, which has a single proton. Large numbers of neutrons are produced by both nuclear fusion and fission. They are crucial to the fission, fusion, and neutron capture processes that result in the nucleosynthesis of chemical elements in stars.
What are neutrons found in an atom?Two subatomic particles known as neutrons and protons are found in the nucleus of every atom. The only exception is hydrogen, which has one proton in its nucleus. Neutrons are somewhat heavier than positively charged protons and have an electric charge that is neither positive nor negative.
Briefing:• ₉₅ Am²⁴3 -----> ₅₃I¹³⁴ + ₄₂Mo¹⁰⁷ + 3 ₀n¹
• From the above reaction, three neutrons are produced.
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how many grams of sodium chloride are there in 550.0 ml of a 1.90 m aqueous solution of sodium chloride? question 28 options: 6.11 × 104 61.1 30.5 1.05 122
61.1 grams of sodium chloride.
Molar concentration is a unit of measurement for the concentration of a chemical species, specifically a solute, in a solution, expressed as the amount of substance per unit volume of solution. The most commonly used unit for molarity in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm³ in SI units.
Molarity (M) is the most commonly used unit of solution concentration and is defined as the amount of solute in moles divided by the volume of solution in liters:
M = moles of solute/liters of solution.
A mole is a unit of measurement for a chemical substance, from which the term "molarity" derives.
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How many grans of oxygen can be produced when 15.6g of sulfur trioxide are decomposed?
9.35 grams of oxygen can be produced when 15.6g of sulfur trioxide are decomposed.
How to find ?2SO₃ → 2S + 3O₂
15.6gSO₃ ˣ 1molSO₃ / 80.07gSO₃ ˣ 3molO₂/2molSO₃ˣ32.00gO₂/1molO₂
= 9.35181716g O₂
=9.35g O₂
What is Stoichiometry?For a method that chemists employ to quantify quantities in reactions, stoichiometry is a huge word. To connect the reactants and products in reactions, it makes use of the coefficient ratio established by balanced reaction equations.
Calculating the amounts of reactants and products in a chemical process is called stoichiometry. A balanced solution is required!
• Examples of reaction stoichiometry questions concern quantities in reactions. The resources needed to answer this question are currently at our disposal.
We simply need to learn a new approach to put skills like writing chemical formulas, figuring out formula masses, and putting mass, particles, and gas volume into moles into use.
• Mole to Mole Conversions: The Mole Ratio is required.
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How to find ?draw the lewis structure for the polyatomic hydronium anion. be sure to include all resonance structures that satisfy the octet rule.
the lewis structure for the polyatomic hydronium cation is H₃O⁺.
The hydronium ion is written as :
H₃O⁺, to fulfil the octet rule there will be 8 valence electrons.
number of valence electrons are :
number of valence electron for 1st H atom = 1
number of valence electron for 2nd H atom = 1
number of valence electron 3rd H atom = 1
number of valence electron s for O = 6
the + sign show that there is loss of one electron, the more electronegative atom is Oxygen atom that means O atom is the central atom. therefore it has 8 valence electrons. the lewis structure is shown as below :
[ H - O : - H ]⁺
|
H
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what is the minimum change of entropy that occurs in 0.200 kg of ice at 273 k when 7.40 x 104 j of heat is added so that it melts to water?
The gas's change in entropy is 243.42J/K, which is less than the minimal change in entropy that occurs when 7.40 x 104 j of heat are injected to melt 0.200 kg of ice at 273 k.
Entropy: What Does It Mean in Life?
Every aspect of daily life is impacted by entropy, a measure of chaos. Actually, you might think of it as nature's tax. If left uncontrolled, disorder worsens over time. Chaos results from energy dissipation in systems. The more disorderly something is, the more entropic it is in our eyes.
What's an illustration of entropy?
Ice melting is the ideal illustration of entropy. The individual molecules are arranged and fixed as ice. When ice melts, its molecules change to
Briefing:
ΔH=mL
ΔH=0.200*333000
=66600J
ΔS=ΔH/T
=66600/273.15
=243.42J/K
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find the volume of 0.200 m sulfuric acid necessary to react completely with 79.7 g sodium hydroxide.;
Determine the number of moles of NaOH present, then the number of moles of H2SO4 required to react with 7.97 g of NaOH, and finally, write the correct balanced equation for the reaction. Lastly, determine how much H2SO4 is required to produce 0.25 moles of H2SO4.
How is a 2M H2SO4 solution made?you add 100 ml of concentrated H2SO4 to 900 ml of ordinary water. Once you've combined everything, you'll have 2 moles of H2SO4 in 1L of the solution, or 2M H2SO4.
How do you figure out how many grams you need to make a solution?1. To determine how many moles of NaCl you need, multiply the concentration (0.5 mols/Liters) by the desired volume of solution (0.5 Liters). 2. To determine how many grams of solute are required, multiply the moles of NaCl by their molar mass (58.44 g/mol).
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ammonium nitrate decomposes explosively upon heating according to the following balanced equation: 2nh4no3(s)→2n2(g) o2(g) 4h2o(g) part a calculate the total volume of gas (at 135 ∘c and 769 mmhg ) produced by the complete decomposition of 1.59 kg of ammonium nitrate.
The answer is 1687.74 L.
Solution:
PV = nRT
Divide both sides by P
V = nRT / P
V = (68.25 × 62.363 × 297) / 749
V = 1687.74 L.
Heating ammonium nitrate NH4NO3 produces nitrous oxide N2O and water H2O. The above equation is the balanced chemical reaction for the decomposition of ammonium nitrate when heated. 1 mol of ammonium nitrate breaks down into 1 mol of nitrous oxide and 2 mol of water molecules.
As mentioned earlier, potassium nitrate decomposes into metallic nitrites and oxygen gas. Potassium nitrate can be said to not produce nitrogen dioxide when heated. However, at sufficiently high temperatures, ammonium nitrate itself can violently decompose. This process produces gases such as nitrogen oxides and water vapor. It is this rapid release of gas that causes the explosion.
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which of the following statements are true? select all that apply. which of the following statements are true?select all that apply. the larger the atom, the more polarizable it is. in terms of the total attractive forces for a given substance, the contribution of dipole-dipole interactions, when present, are always larger than the contributions of dispersion forces. all other factors being the same, dispersion forces between linear molecules are greater than dispersion forces between molecules whose shapes are nearly spherical. when comparing ne and xe , the boiling point of ne is expected to be higher because dispersion forces decrease going down a column in the periodic table. for molecules with similar molecular weights, the dispersion forces become stronger as the molecules become more polarizable
The true statements are 1, 3, 4 and 5 for the properties of atom and molecules.
Define the term chemical bond?Atoms in molecules are held together by chemical bonds. Electrostatic forces between negatively charged electrons and positive charge atomic nuclei give rise to bonds.1. The statement is true:
Generally speaking, polarizability increases as electron volume increases. This happens in atoms because larger atoms have less firmly bound electrons compared to smaller atoms, which have more loosely held electrons. More polarizable than smaller atoms are larger molecules, atoms, or ions.2. The statement is false.
As we go down the group, the dispersion forces increases and they can be stronger than any other interactions.3. The statement is true.
In comparison to molecules with a linear shape, spherical molecules have less surface area and a lower dispersion force.4. The statement is true.
As the polarizable size of the molecules increases down the group, the boiling points also increase. As you move down the column of noble gases, their increasing diameters and resulting greater and greater London dispersion forces are apparent. The boiling point is set by these intermolecular interactions. The easier it is to separate the atoms, the smaller the force.5. The statement is true.
The dispersion forces get stronger when polarizability increases. As a result, molecules are more attracted to one another, and the melting and boiling points of covalent compounds increase with increasing molecular mass. Through the affected molecules' impacted molecules' molecular shapes, polarizability also affects dispersion forces.To learn more about chemical bonds visit:
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If the density of carbon tetrachloride is 0. 793 g/ml, and a sample has a volume of 9. 29 ml, what is the mass?.
If the density of carbon tetrachloride is 0. 793 g/ml, and a sampl.e has a volume of 9. 29 ml the mass is 7.367 g
For CCl4
Density of carbon tetrachloride = 0.793 g/ml
Volume of sample = 9.29ml
mass = density * volume = 0.793 × 9.29 = 7.367 g
The chemical name for carbon tetrachloride, sometimes referred to as tetrachloromethane and recognized by the IUPAC, carbon tet in the cleaning business, Halon-104 in firefighting, and Refrigerant-10 in HVACR, is CCl4. It is an organic compound. It has an indistinct color and a just perceptible "sweet" odor. At lower temperatures, it is almost incombustible. Prior to being phased out because to environmental and safety concerns, it was frequently used in fire extinguishers, as a predecessor to refrigerants, and as a cleaning agent. The central nervous system can be impacted as well as the liver and kidneys when exposed to high amounts of carbon tetrachloride, particularly its vapor. An extended exposure risk can be lethal.
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Fill in the missing curved arrows to show the preparation of this product from the hydrochlorination of a conjugated diene.
Then in part two select the common elementary steps.
missing curved arrows to show the preparation of this product from the hydrochlorination of a conjugated diene. Then in part two select the common elementary steps.
Two double bonds and a single bond are what distinguish conjugated diene. Conjugated diene, notably butadiene, play a crucial role in the creation of rubber and, consequently, in the creation of the tires on our automobiles. hydrochlorination In order to chlorinate an unsaturated hydrocarbon, hydrogen chloride must be added across its numerous bonds. Alkyne (triple-bonded) reactants are the focus of Johnson Matthey's DAVYTM hydrochlorination technology. A chlorinated alkene results from this exothermic reaction.
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what is the percent yield of hcl if 42.0 g of hcl are produced from the reaction of 62.0 g of pcl3? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 28.4% 72.8% 85.0% 93.5%
The percent yield of HCl is 85.0%.
In chemistry, yield, also referred to as reaction yield, is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.
%yield = (actual yield/theoretical yield) x 100
The presence of impurities lowers the actual yield, which lowers the percentage yield. The purity of the reactants influences the percentage yield. Highly pure reactants tend to increase actual yield and, as a result, percentage yield.
A percentage yield greater than 100 percent is only possible if the product is contaminated with impurities or if all of the solvent from the reaction mixture has not been dried off.
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list the addition reactions of alkenes and alkynes. what similarities do you see in the addition reactions? do you notice any differences?
The list the addition reactions of alkenes and alkynes are as follows:
Addition Reactions of Alkenes:
1. Halogenation: Alkenes react with halogens to form halohydrins.
2. Hydration: Alkenes react with water to form alcohols in the presence of an acid catalyst.
3. Hydrohalogenation: Alkenes react with hydrogen halides to form alkyl halides.
4. Hydrogenation: Alkenes react with hydrogen in the presence of a metal catalyst to form alkanes.
5. Hydroboration-Oxidation: Alkenes react with borane to form alcohols.
Addition Reactions of Alkynes:
1. Halogenation: Alkynes react with halogens to form dihalides.
2. Hydration: Alkynes react with water to form ketones in the presence of an acid catalyst.
3. Hydrohalogenation: Alkynes react with hydrogen halides to form alkyl halides.
4. Hydrogenation: Alkynes react with hydrogen in the presence of a metal catalyst to form alkanes.
5. Hydroboration-Oxidation: Alkynes react with borane to form aldehydes.
Similarities: Both alkenes and alkynes undergo the same types of addition reactions.
Differences: The products of the addition reactions are different depending on the type of compound being reacted. For example, alkenes form alcohols when reacted with water, while alkynes form ketones.
What do you mean by Alkynes?
Alkynes are a group of hydrocarbons that contain at least one triple bond between two carbon atoms. They are also known as acetylenes and are unsaturated hydrocarbons with the general chemical formula of CnH2n-2.
What do you mean by Alkenes?
Alkenes are a class of hydrocarbons characterized by a carbon–carbon double bond. They are typically colorless, flammable, gases or liquids with a sweet odor. Alkenes are a major component of gasoline and are used in the manufacture of plastics and other industrial materials.
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10 g of methane (ch4) is combusted in a calorimeter that has an empty heat capacity of 18 j/°c. the calorimeter contained 150 g of water. if the temperature changed from 25.2 °c to 30.3 °c, calculate the molar heat of combustion of methane in j/mol.
The molar heat of the combustion of methane in j/mol is 5267.52 J/mol.
Given,
m = 10 g of CH₄
mol = mass/MW = 10/16 = 0.625 mol
C = 18 J/C
m = 150 g o water
dT = 30.3 - 25.5 = 4.8°C
Calculate molar combustion of methane,
calculate heat,
Q(empty) = C × dT = 18* (30.3-25.2) = 91.8 J
Q(water) = m × Cp(dT) = 150*4.184*(30.3-25.2) = 3200.76 J
Total q= 91.8 +3200.76 = 3292.2 J
This is done for 10 g of methane
Therefore,
If n = 0.625 present
Then,
H(rxn) = Q/n = 3292.2 / 0.625 = 5267.52 J/mol
Hence, the molar heat of the combustion of methane in j/mol is 5267.52 J/mol.
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If exactly one molecule of solute is present in 1. 00 l of solution, what is the concentration of the solution?.
If 1.0 l of solution contains exactly 1 molecule of the solute. The concentration in the solution is 1.66x10-24 M.
What does concentration mean in science?The quantity of a substance, like salt, that is present in a specific volume of tissues or liquid, like blood, according to science. When there is less water present, the material becomes more concentrated. For instance, when a person will not really drink enough water, the concentration of salt in their urine may increase.
Why is it vital to concentrate?Why is it so crucial to focus? You can use your resources more effectively and address difficulties more effectively when you are focused. It is less probable that you would overlook crucial facts when you are focused. Maintaining focus makes it easier for you to recall information.
Briefing:1 mole = 6.02x10^23 particles,
((1 mole)/(6.02x10^23 molecules))
(1 molecule)/((1 mole)/(6.02x10^23 molecules))
= 1.66x10^-24 moles
=1.66x10^-24 moles/ volume,
= 1.0L here:
=(1.66x10^-24 moles solute)/(1.0 Liter)
= 1.66x10^-24 molar,
= 1.66x10^-24 M
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A diatomic element has six bonding electrons, six non-bonding electrons, and 2 anti-bonding electrons. What is the bond order?.
Answer:
10 pts
Explanation:
what is the structure of benzene? what are the different ways in which this structure is represented
The aromatic compound benzene, with the chemical formula C6H6, is one of the most well-known ones.
Benzene has a mass average of roughly 78.112, and its chemical formula is C6H6, meaning it comprises six carbon atoms and six hydrogen atoms. Three double bonds and a six-carbon ring, symbolized by a hexagon, are present in the structure. A corner that is bonded to other atoms represents the carbon atoms.
Structure of Benzene
Benzene is typically depicted structurally as a six-carbon ring with three double bonds (shown by a hexagon). Every carbon atom that a corner represents is also connected to one other atom. These are hydrogen atoms that are present in benzene. We can identify the arrangement as including conjugated double bonds since the double bonds are separated by single bonds.
An alternative representation of the six pi electrons employs a circle inside a hexagon. These symbols all have positive and negative qualities. The three double bond symbol will be used simply because it is frequently used in the text.
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what prediction can be made about the entropy change during the proposed synthesis of solid nitrogen?
When S is negative, entropy falls The entropy change during the suggested synthesis of solid nitrogen can be predicted.
What is entropy, in the simplest possible terms?
Lower entropy can be viewed as an approximate measure of energy quality, with higher quality being associated with lower entropy. Lower entropy energy is structured for storage (the efficient library). Energy is chaotically stored in the random-pile library, which has a high entropy.
What Does Entropy Mean in Real Life?
Every aspect of daily life is impacted by entropy, which measures disorder. Actually, you might think of it as nature's tax. If left uncontrolled, disorder worsens over time. Chaos results from energy dissipation in systems. As something becomes more disorderly,
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apollo spas services 297 hot tubs. if each hot tub needs 115 ml of muriatic acid, how many liters of acid are needed for all of the hot tubs?
The number of liters of acid needed for all of the hot tubs is the total volume of muriatic acid, which is 31, 155 ml.
Volume refers to the space occupied within the boundaries of an object in three-dimensional space. It is also called as the capacity of the object. In an object is filled with a liquid complete, there volume is the same.
In the given case that total volume of the acid would be the product of volume of each hot tub and number of hot tub containers. Hence, it is given by:
Total volume = Volume of each hot tub x number of hot tub containers
According to the given data:
Volume of each hot tub = 115 ml
Number of hot tub containers = 297
Hence,
Total volume = 115 x 297 = 31, 155 ml
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one of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell: group of answer choices o2 gas is always produced at the cathode. a non-spontaneous reaction is forced to occur. only non-aqueous electrolyte solutions can be used. an electric current is produced by a chemical reaction. electron transfer does not occur. electrons flow towards the anode.
The key difference between voltaic and electrolytic cells is that in a voltaic cell, the flow of electrons is the result of a spontaneous redox reaction, whereas in an electrolytic cell, electrons are pushed by an outside power source, such as a battery.
In an electrolytic cell, The creation of electrical energy in this instance is caused by a spontaneous redox reaction. Electrical energy must be provided to start the redox reaction since it is not spontaneous. An external voltage in an electrolytic cell causes a current to flow through the cell, which in turn triggers a chemical reaction that is not spontaneous. The development of a spontaneous chemical reaction in a galvanic cell results in the passage of an electric current.
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a compound contains 39.37% chromium, 38.10% oxygen, and potassium. what percentage of the compound is potassium
The percentage of the compound is potassium is 22.53 %.
given that :
compound contains percentage of chromium = 39.37 %
compound contains percentage of oxygen = 38.10 &
compound contains percentage of potassium = ?
compound contains percentage of potassium = - 100%
(percentage of chromium + percent of oxygen )
= 100 % - (39.37 % + 38.10 %)
= 100 % - 77.47 %
= 22.53 %
The percent of potassium in total percent of compound is 22.5 %.
Thus, a compound contains 39.37% chromium, 38.10% oxygen, and potassium. percentage of the compound is potassium is 22.53 %.
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If 60 g of a radioactive substance naturally decays to 15 g after 16 hours, what is the half-life of the radioisotope?.
A radioactive source's half-life is 8 hours if 60 g of it drops voluntarily to 15 g in 16 hours.
What are radioisotopes, and how are their radioactivity levels determined?
The number of protons in the atomic nuclei of the constituent atoms of a given chemical is constant, whereas the number of neutrons changes. Radioisotopes are the name for an element's radioactive constituents. They can also be referred to as unstable neutron-proton pairings or atoms with too much electrical energy in their nucleus. The Contributes to the continuing (Bq), the international unit, or the Cobalt (Ci), the official machine in the United States, are used to report actual radiation levels.
Complete life divided by half.
Half-life equals 16/2
8 hours is the half-life.
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when two oxygen atoms form a chemical bond in a system, what happens to the energy and the stability of the system?
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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Mg2+
Draw the Lewis dot structure for Mg2+. Show the charge. To change the symbol of an atom, double-click on the atom and enter the letter of the new atom.
In the two outermost orbitals of magnesium atoms, there are two electrons. In order to become Mg2+, an atom can shed two electrons.
Dots of electrons are represented as Lewis structures, sometimes known as Lewis symbols. In order to create the magnesium ion, or Mg2+, two electrons are supplied by the Mg atom.
As opposed to Mg2+, whose electronic configuration was discovered to be 1s2 2s2 2p6, which has the electron density of Mg as 1s2 2s2 2p6. Magnesium has a 12 atomic number.
Create a Lewis electronic band diagram by picturing the sign for mg inside a box that contains all of the core electrons. The valence electrons are then positioned so that the greatest energy level orbital on each of the box's sides corresponds to their placement.Eight electrons from the Mg2+ ion occupy the empty space in the second orbital.
Here, it should be noted that this ion possesses 8 electrons and a 2 valence shell. As a result, the Lewis structure includes eight points, and because it is a charged molecule, it is also necessary to mention the net charge. Consequently, Mg2Lewis +'s structure.
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16.3 l n2 at 25 °c and 125 kpa and 43.1 l o2 at 25 °c and 125 kpa were transferred to a tank with a volume of 5.25 l. what is the total pressure at 43 °c?
Its pressure distribution (in kpa) for 65 °C is P=13.32atm after 18.7 l n2 with 41. 9 l o2 and 25 °C and 125 kpa was transported to a container with such a capacity of 7. 00 l.
What is pressure and its types?A physical force applied to an object is known to as pressure. For unit area, a perpendicular force is delivered to a surface of the objects. T r is the fundamental formula for pressure. Phases of project are a unit of pressure (Pa). Absolute, ambient, differential, and gauge pressures are different types of pressure.
Briefing:That number of molecules of N2 is now determined
P₁.V₁=n₁.R.T₁
1.233×16.3=n₁×0.0821×298
n₁=0.822 mol
In a similar manner, we determine the quantity of O2 moles.
P₂.V₂=n₂.R.T₂
1.233×32.3=n₁×0.0821×298
n₂=1.628mol
The total number of moles of gas that must be pumped into the vessel with the dimensions of V = 4.50 L and T = 298 K equals
n=n₁+n₂
=0.822+1.628mol
=2.45mol
Let P represent the gas's final pressure,
PV=nRT
P×4.50=2.45×0.0821×298
P=13.32atm
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predict the bond order for the molecule cs2, which exists in the gas phase at high temperature. would cs2 be paramagnetic or diamagnetic?
The CS₂ molecules has bond order has two and has diamagnetic behaviours.
A volatile liquid with the chemical name carbon disulfide, CS₂ is an organosulfur compound. It is also known as methanedithione, disulfidocarbon, and carbon bisulfide.Sulfur, bromine, lipids, rubber, phosphorus, asphalt, selenium, iodine, and resins can all be dissolved in carbon disulfide. It is frequently employed in the production of flotation agents as well as the purification of single-walled carbon nanotubes. Carbon disulfide is a toxic, combustible, colourless to light yellow, volatile liquid with a pungent odour. It is insoluble in water and has a flash point of -22°F. It sinks because it is denser than water.
Hence, carbon covalently bond with Sulphur to carbon disulphide.
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if 0.75 g of a monoprotic weak acid required 22.50 ml of 0.510 m naoh to titrate it, what is the molar mass of the acid? select one: 86 g/mol 51 g/mol 65 g/mol 33 g/mol 153 g/mol
The molar mass of the acid: 65.36 g/mol
Calculate the molar mass of given acid?
Balanced chemical equation is:
HA + NaOH ---> NaA + H2O
let's calculate the mol of HA
volume , V = 22.5 mL
= 2.25×[tex]10^{-2}[/tex] L
using:
number of mol, n = Molarity×Volume
= 0.51×2.25×[tex]10^{-2}[/tex]
= 1.147×[tex]10^{-2}[/tex] mol
According to balanced equation:
mol of NaOH reacted = (1/1) × moles of HA
= (1/1)×1.147×[tex]10^{-2}[/tex]
= 1.147×[tex]10^{-2}[/tex] = number of moles of NaOH.
using:
number of mol = mass / molar mass
1.147×[tex]10^{-2}[/tex] mol = (0.75 g)/molar mass
molar mass = 65.36 g/mol
Therefore, The molar mass of the acid: 65.36 g/mol.
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brainly a mixture of two gases with a total pressure of 5.60 atm contains 0.40 atm of gas a. what is the partial pressure of gas b?
The partial pressure of gas B is 5.2 atm.
What do you understand by partial pressure?
When more than one gas is present in a container, each gas exerts pressure, which is known as partial pressure. Its partial pressure refers to the pressure of any gas inside the container.
Let there be n different gases in the mixture, each at a different pressure (P1, P2, etc.)
Then the total pressure will be:
[tex]P_{total}[/tex] = ∑[tex]P_{1}[/tex] + [tex]P_{2}[/tex] + [tex]P_{3}[/tex]
Now, partial pressure of mixture of gas containing gas A = [tex]P_{A}[/tex]
partial pressure of mixture of gas containing gas B = [tex]P_{B}[/tex]
Total pressure of gas = 5.60 atm
Pressure of gas [tex]P_{A}[/tex] = 0.40 atm
[tex]P_{total}[/tex] = [tex]P_{A}[/tex] + [tex]P_{B}[/tex]
5.60 atm = 0.40 atm + [tex]P_{B}[/tex]
[tex]P_{B}[/tex] = 5.60 - 0.40 = 5.2 atm
So, the partial pressure of gas B is 5.2 atm.
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N2 (g) effuses at a rate that is _________ times that of xe(g) under the same conditions.
There will be variances between isotopes, however by ignoring these and using the avg mol wt of N2 = 28 and Xe = 132; Rate(N2)/Rate(Xe) = sqrt (132/28) = 2.17
What an isotope is instead ?Isotopes are atoms with the same quantity of protons but differing numbers of neutrons. They differ in mass, which affects their physical characteristics even if they have nearly identical chemical makeup.
What makes anything an isotope?There are three known one-proton nuclei that have 0 neutrons, 1 neutrons, and 2 neutrons, respectfully. They are known as hydrogen isotopes (first from Greek isos, which means "same," and topos, which means "place") since they all occupy the same location in the periodic chart that is designated for atomic number 1.
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discuss the equilibrium that eventually results if a solid is placed in an initially evacuated closed container and is maintained at a given temperature
The equilibrium that eventually results if a solid is placed in an initially evacuated closed container and is maintained at a given temperature: Thermal equilibrium exists because the solid attains the temperature.
Equilibrium does no longer necessarily imply that reactants and merchandise are present in the same amounts. It approaches that the response has reached a factor in which the concentrations of the reactant and product are unchanging with time due to the fact the ahead and backward reactions have identical charges.
The equilibrium rule says that if a system is in equilibrium then the sum of all of the forces or the net pressure appearing at the machine is 0 due to which the system does now not reveal any linear acceleration and stays at relaxation or moves with a steady velocity. we can write it down as ∑F=zero.
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calculate position of fermi level in n-type silicon with donor concentration of 3x1017 cm-3 at room temperature.
Above 0.115eV from fermi level conduction level is there.
[tex]\begin{aligned}& \eta=3 \times 10^{17} \\& N_c=4.82 \times 10^{15}\left(\frac{m_n}{m}\right)^{3 / 2} T^{3 / 2} \\& N_c=4.82 \times 10^{15} \times(300)^{3 / 2} \quad\left[\because \frac{m n}{m}=1\right] \\& N_c=4.82 \times 10^{15} \times(300)^{3 / n} \quad \\& N_c=250.45 \times 10^{17}\end{aligned}[/tex]
[tex]\begin{aligned}& E_C-E_F=0.026 \ln \left(\frac{250.45}{3}\right) \\& E_C-E_F=0.026 \times 4.42 \\& E_C-E_F=0.115 \mathrm{ev} . \\& E_C=E_F+0.115 \mathrm{VN}\end{aligned}[/tex]
Above 0.115eV from fermi level conduction level is there.
The Fermi Level is the maximum energy level an electron may occupy when it is at absolute zero degrees Fahrenheit. Since the electrons are all in the lowest energy state at absolute zero, the Fermi level is located between the valence band and conduction band.
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