chem 9-11

For the reaction represented by the equation 2KlO3→ 2KCl + 3O2, how many moles of potassium chlorate are required to produce 250. g of oxygen?

5.21 mol

Convert the pressure 0.75 atm to mm Hg.

570 mm Hg

For the reaction represented by the equation 2Fe + O2→ 2FeO, how many grams of iron(II) oxide are produced from 8.00 mol of iron in an excess of oxygen?

575 g

For the reaction represented by the equation 2HNO3 + Mg(OH)2→ Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3, and an excess of Mg(OH)2?

593 g

For the reaction represented by the equation 2Na + Cl2→ 2NaCl, how many grams of chlorine gas are required to react completely with 2.00 mol of sodium?

70.9 g

What is the study of the mass relationships among reactants and products in a chemical reaction?

Reaction Stoichiometry

Why does the air pressure inside the tires of a car increase when the car is driven?

The air particles inside the tire increase their speed because their temperature rises.

What happens to the volume of a gas during compression?

The volume decreases.

If the temperature remains constant, V and P represent the original volume and pressure, and V' and P' represent the new volume and pressure, what is the mathematical expression for Boyle's law?

VP= V'P'

To balance a chemical equation, it may be necessary to adjust the

coefficients.

A real gas

does not obey all the assumptions of the kinetic-molecular theory.

By which process do gases take the shape of their container?

expansion

For the reaction represented by the equation 2Na + 2H2O → 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?

120 g

The volume of a gas collected when the temperature is 11.0°C and the pressure is 710 mm Hg measures 14.8 mL. What is the calculated volume of the gas at 20.0°C and 740 mm Hg?

14.6 mL

At 7.0°C, the volume of a gas is 49 mL. At the same pressure, its volume is 74 mL at what temperature?

150°C

In the reaction represented by the equation N2 + 3H2→ 2NH3, what is the mole ratio of nitrogen to ammonia?

1:2

In the reaction represented by the equation N2(g) + 2O2(g) <ιμγ ωιδτη="15" ηειγητ="15" αλιγν="βοττομ" αλτ="μχ062-1.ϕπγ" σρχ="ηττπσ://αππ.σχηοολογψ.χομ/σψστεμ/φιλεσ/ατταχημεντσ/παγε_εμβεδσ/μ/2017-02/μχ062-1_58β5α78χ2εεφ0.ϕπγ" βορδερ="0"> 2NO2(g), what is the volume ratio of N2 to NO2?

1:2

How many times greater is the rate of effusion of molecular fluorine than that of molecular bromine at the same temperature and pressure?

2.051

Three samples of gas each exert 740. mm Hg in separate 2 L containers. What pressure do they exert if they are all placed in a single 2 L container?

2.22 mc048-2.jpg103 mm Hg

For the reaction represented by the equation 3Fe + 4H2O → Fe3O4 + 4H2, how many moles of iron(III) oxide are produced from 500. g of iron in an excess of H2O?

2.98 mol

The volume of a sample of oxygen is 300.0 mL when the pressure is 1.00 atm and the temperature is 27.0°C. At what temperature is the volume 1.00 L and the pressure 0.500 atm?

227°C

A 1.00 L sample of a gas has a mass of 1.25 g at STP. What is the mass of 1.00 mol of this gas?

28.0 g

In the reaction represented by the equation C + 2H2→ CH4, what is the mole ratio of hydrogen to methane?

2:1

Which equation is not balanced?

2H20+02+H20

The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) → 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?

3.0 mol

Chlorine is produced by the reaction 2HCl(g) → H2(g) + Cl2(g). How many grams of HCl (36.5 g/mol) must be used to produce 10.0 L of chlorine at STP?

32.6 g

For the reaction represented by the equation SO3 + H2O → H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid in an excess of water?

320 grams

In the equation 2KClO3→ 2KCl + 3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decompose completely?

4.5 mol

The equation for the production of methane is C + 2H2(g) <ιμγ ωιδτη="15" ηειγητ="15" αλιγν="βοττομ" αλτ="μχ063-1.ϕπγ" σρχ="ηττπσ://αππ.σχηοολογψ.χομ/σψστεμ/φιλεσ/ατταχημεντσ/παγε_εμβεδσ/μ/2017-02/μχ063-1_58β5α78χ59βδ7.ϕπγ" βορδερ="0"> CH4(g). How many liters of hydrogen are needed to produce 20. L of methane?

40. L

A 1.00 L sample of a gas has a mass of 1.92 g at STP. What is the molar mass of the gas?

43.0 g/mol

In the reaction represented by the equation 2Al2O3→ 4Al + 3O2, what is the mole ratio of aluminum to oxygen?

4:3

For the reaction represented by the equation CH4 + 2O2→ CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100. g of methane?

6.23 mol

Convert the pressure 0.840 atm to mm Hg

638 mm Hg

A sample of oxygen occupies 560. mL when the pressure is 800.00 mm Hg. At constant temperature, what volume does the gas occupy when the pressure decreases to 700.0 mm Hg?

640. mL

For the reaction represented by the equation AgNO3 + NaCl → NaNO3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO3?

7.0 mol

The volume of a gas is 93 mL when the temperature is 91°C. If the temperature is reduced to 0°C without changing the pressure, what is the new volume of the gas?

70. mL

When the formula equation Fe3+O4+AL=AL2is correctly balanced the coefficient of Fe is number

9

For the reaction represented by the equation N2 + 3H2→ 2NH3, how many moles of nitrogen are required to produce 18 mol of ammonia?

9.0 mol

The pressure of a sample of gas at 10.0°C increases from 700. mm Hg to 900. mm Hg. What is the new temperature?

90.9°C

The expression V = kn is a statement of

Avogadro's law.

The principle that under similar pressures and temperatures, equal volumes of gases contain the same number of molecules is attributed to

Avogadro.

Which is an example of effusion?

air slowly escaping from a pinhole in a tire

Avogadro's law led to the realization that the molecules of some substances

are diatomic.

Which instrument measures atmospheric pressure?

barometer

Two gases have the same temperature but different pressures. The kinetic-molecular theory does not predict that

both gases have the same densities

Gay-Lussac recognized that at constant temperature and pressure, the volumes of gaseous reactants and products

can be expressed as ratios of small whole numbers.

According to Avogadro's law, 1 L of H2(g) and 1 L of O2(g) at the same temperature and pressure

contain equal numbers of molecules.

Which of the following properties do solids share with liquids?

definite volume

If a gas with an odor is released in a room, it quickly can be detected across the room because it

diffuses.

Under which conditions do real gases most resemble ideal gases?

low pressure and high temperature

A balanced chemical equation allows one to determine the

mole ratio of any two substances in the reaction.

According to the kinetic-molecular theory, particles of an ideal gas

neither attract nor repel each other but collide.

At STP, the standard molar volume of a gas of known volume can be used to calculate the

number of moles of gas.

At constant temperature and pressure, gas volume is directly proportional to the

number of moles of gas.

If the temperature of a fixed quantity and volume of gas changes, what also changes?

pressure

If V, P, and T represent the original volume, pressure, and temperature in the correct units, and V', P', and T' represent the new conditions, what is the combined gas law?

pv/T=p'v'/T

The coefficients in a chemical equation represent the

relative numbers of moles of reactants and products.

According to the kinetic-molecular theory, particles of matter are in motion in

solids, liquids, and gases.

In what kind of reaction do two or more substances combine to form a new compound?

synthesis reaction

An ideal gas is a hypothetical gas

that conforms to all of the assumptions of the kinetic theory.

According to the kinetic-molecular theory, which is the most significant difference between gasses and liquids?

the distance between the particles

The gas pressure inside a container decreases when

the number of gas molecules is decreased.

In the expression V = kn, n represents

the number of moles of gas.

Which is an example of gas diffusion?

the odor of perfume spreading throughout a room

Unlike in an ideal gas, in a real gas

the particles exert attractive forces on each other.

According to Graham's law, the rates of effusion of two gases at the same temperature and pressure are inversely proportional to

the square roots of their molar masses.

If the pressure and temperature of a gas are held constant and some gas is added to the container or some is allowed to escape, a change is which of the following can be observed?

volume

For the reaction represented by the equation Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of lead(II) iodide are produced from 300. g of potassium iodide and an excess of Pb(NO3)2?

0.904 mol

Standard temperature is exactly

0°C.

What is the pressure exerted by 1.2 mol of a gas with a temperature of 20.°C and a volume of 9.5 L?

3.0 atm

A mixture of four gases exerts a total pressure of 860 mm Hg. Gases A and B each exert 220 mm Hg. Gas C exerts 110 mm Hg. What pressure is exerted by gas D?

310 mm Hg

For the reaction represented by the equation Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?

1.00 mol

How many times greater is the rate of effusion of oxygen gas than that of carbon dioxide gas at the same temperature and pressure?

1.375( this one was marked wrong but in his work it showed this as the answer?)

On a cold winter morning when the temperature is -13°C, the air pressure in an automobile tire is 1.5 atm. If the volume does not change, what is the pressure after the tire has warmed to 15°C?

1.7 atm

For the reaction represented by the equation 2H2 + O2→ 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?

108 g

For the reaction represented by the equation 2H2 + O2→ 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?

12 mol

What is the number of moles of H2 produced when 23 g of sodium react with water according to the equation 2Na(s) + 2H2O(l) <ιμγ ωιδτη="15" ηειγητ="15" αλιγν="βοττομ" αλτ="μχ064-1.ϕπγ" σρχ="ηττπσ://αππ.σχηοολογψ.χομ/σψστεμ/φιλεσ/ατταχημεντσ/παγε_εμβεδσ/μ/2017-02/μχ064-1_58β5α78χ84243.ϕπγ" βορδερ="0"> 2NaOH(aq) + H2(g)?

0.50 mol

Standard pressure is exactly

1 atm.

Given the equation 3A+2B=2C, the starting mass of A, and its molar mass, and you are asked to determine the moles of C produced, your first step in solving the problem is the multiply the given mass of A by

1 mol A/molar mass A

A pressure of 745 mm Hg equals

1 torr. (aparently this one is wrong)