Question 1

Standard temperature and pressure (STP), in the context of gases, refers to _.

Accepted Answer

A)  298 K and 1 atm 
B)  273 K and 1 atm 
C)  273 K and 1 torr 
D)  298 K and 1 torr 
E)  273 K and 1 pascal 
A)  298 K and 1 atm 
B)  273 K and 1 atm 
C)  273 K and 1 torr 
D)  298 K and 1 torr 
E)  273 K and 1 pascal

Question 2

The total pressure exerted by a mixture of 1.50 g of H2 and 5.00 g of N2 in a 5.00- L vessel at 298 K is atm.

Accepted Answer

A)  4.54 
B)  32.4 
C)  1.06 
D)  5.27 
E)  9.08 
A)  4.54 
B)  32.4 
C)  1.06 
D)  5.27 
E)  9.08

Question 3

The molecular weight of a gas that has a density of 7.10 g/L at 25.0 °C and 1.00 atm pressure is
G/mol.

Accepted Answer

A)  28.0 
B)  174 
C)  5.75 × 10- 3 
D)  6.85 × 10- 2 
E)  14.6 
A)  28.0 
B)  174 
C)  5.75 × 10- 3 
D)  6.85 × 10- 2 
E)  14.6

Question 4

One significant difference between gases and liquids is that _ .

Accepted Answer

A)  a gas is made up of molecules 
B)  gases are always mixtures 
C)  a gas may consist of both elements and compounds 
D)  a gas assumes the volume of its container 
E)  All of the above answers are correct. 
A)  a gas is made up of molecules 
B)  gases are always mixtures 
C)  a gas may consist of both elements and compounds 
D)  a gas assumes the volume of its container 
E)  All of the above answers are correct.

Question 5

The density of is 0.900 g/L at STP.

Accepted Answer

A)  CH4  
B)  NO 
C)  N2  
D)  CO 
E)  Ne 
A)  CH4  
B)  NO 
C)  N2  
D)  CO 
E)  Ne

Question 6

A mixture of carbon dioxide and an unknown gas was allowed to effuse from a container. The carbon dioxide took 1.25 times as long to escape as the unknown gas. Which one could be the unknown gas?

Accepted Answer

A)  H2  
B)  HCl 
C)  SO2  
D)  Cl2  
E)  CO 
A)  H2  
B)  HCl 
C)  SO2  
D)  Cl2  
E)  CO

Question 7

The average kinetic energy of the particles of a gas is directly proportional to _ .

Accepted Answer

A)  the square of the particle mass 
B)  the particle mass 
C)  the square root of the rms speed 
D)  the square of the rms speed 
E)  the rms speed 
A)  the square of the particle mass 
B)  the particle mass 
C)  the square root of the rms speed 
D)  the square of the rms speed 
E)  the rms speed

Question 8

SO2 (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0 °C. The partial pressure of CO2 in the container was _ atm.

Accepted Answer

A)  6.78 
B)  4.02 
C)  1.60 
D)  0.192 
E)  2.76 
A)  6.78 
B)  4.02 
C)  1.60 
D)  0.192 
E)  2.76

Question 9

According to kinetic- molecular theory, if the temperature of a gas is raised from 100 °C to 200 °C, the average kinetic energy of the gas will .

Accepted Answer

A)  decrease by half 
B)  increase by a factor of 1.27 
C)  increase by a factor of 100 
D)  double 
E)  decrease by a factor of 100 
A)  decrease by half 
B)  increase by a factor of 1.27 
C)  increase by a factor of 100 
D)  double 
E)  decrease by a factor of 100

Question 10

The first person to investigate the relationship between the pressure of a gas and its volume was

Accepted Answer

A)  Jacques Charles 
B)  Amadeo Avogadro 
C)  Robert Boyle 
D)  Joseph Louis Gay- Lussac 
E)  Lord Kelvin 
A)  Jacques Charles 
B)  Amadeo Avogadro 
C)  Robert Boyle 
D)  Joseph Louis Gay- Lussac 
E)  Lord Kelvin

Question 11

Of the following, is a greenhouse gas.

Accepted Answer

A)  Xe 
B)  CH4  
C)  Cl2  
D)  O2  
E)  C2H4 
A)  Xe 
B)  CH4  
C)  Cl2  
D)  O2  
E)  C2H4

Question 12

Since air is a mixture, it does not have a "molar mass." However, for calculation purposes, it is possible to speak of its "effective molar mass." (An effective molar mass is a weighted average of the molar masses of a mixture's components.) If air at STP has a density of 1.285 g/L, its effective molar mass is g/mol.

Accepted Answer

A)  34.4 
B)  30.0 
C)  26.9 
D)  28.8 
E)  31.4 
A)  34.4 
B)  30.0 
C)  26.9 
D)  28.8 
E)  31.4

Question 13

Of the following gases, has density of 2.104 g/L at 303 K and 1.31 atm.

Accepted Answer

A)  Ar 
B)  Ne 
C)  Xe 
D)  He 
E)  Kr 
A)  Ar 
B)  Ne 
C)  Xe 
D)  He 
E)  Kr

Question 14

A sample of gas (1.3 mol) occupies L at 22 °C and 2.5 atm.

Accepted Answer

A)  0.94 
B)  0.079 
C)  3.2 × 10- 2  
D)  31 
E)  13 
A)  0.94 
B)  0.079 
C)  3.2 × 10- 2  
D)  31 
E)  13

Question 15

Of the following gases, will have the greatest rate of effusion at a given temperature.

Accepted Answer

A)  HBr 
B)  NH3  
C)  CH4  
D)  HCl 
E)  Ar 
A)  HBr 
B)  NH3  
C)  CH4  
D)  HCl 
E)  Ar

Question 16

CO (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0 °C. The partial pressure of CO2 in the container was _ atm.

Accepted Answer

A)  0.292 
B)  6.31 
C)  4.01 
D)  1.60 
E)  10.3 
A)  0.292 
B)  6.31 
C)  4.01 
D)  1.60 
E)  10.3

Question 17

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is
If the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

Accepted Answer

A)  0.179 
B)  0.583 
C)  0.238 
D)  0.417 
E)  0.357 
A)  0.179 
B)  0.583 
C)  0.238 
D)  0.417 
E)  0.357

Question 18

A mixture of He and Ne at a total pressure of 0.95 atm is found to contain 0.32 mol of He and 0.56 mol of Ne. The partial pressure of Ne is atm.

Accepted Answer

A)  1.5 
B)  1.7 
C)  0.60 
D)  0.35 
E)  1.0 
A)  1.5 
B)  1.7 
C)  0.60 
D)  0.35 
E)  1.0

Question 19

According to the kinetic- molecular theory, molecules of different gases at the same temperature always have the same average kinetic energy.

Accepted Answer

A) True 
 B)False

Question 20

A gas at a pressure of 325 torr exerts a force of N on an area of 5.5 m2.

Accepted Answer

A)  59 
B)  2.4 × 105  
C)  2.4 
D)  1.8 × 103  
E)  0.018 
A)  59 
B)  2.4 × 105  
C)  2.4 
D)  1.8 × 103  
E)  0.018

Exam 10: Gases

Standard temperature and pressure (STP), in the context of gases, refers to _.

The total pressure exerted by a mixture of 1.50 g of H2 and 5.00 g of N2 in a 5.00- L vessel at 298 K is atm.

The molecular weight of a gas that has a density of 7.10 g/L at 25.0 °C and 1.00 atm pressure is G/mol.

One significant difference between gases and liquids is that _ .

The density of is 0.900 g/L at STP.

A mixture of carbon dioxide and an unknown gas was allowed to effuse from a container. The carbon dioxide took 1.25 times as long to escape as the unknown gas. Which one could be the unknown gas?

The average kinetic energy of the particles of a gas is directly proportional to _ .

SO2 (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0 °C. The partial pressure of CO2 in the container was _ atm.

According to kinetic- molecular theory, if the temperature of a gas is raised from 100 °C to 200 °C, the average kinetic energy of the gas will .

The first person to investigate the relationship between the pressure of a gas and its volume was

Of the following, is a greenhouse gas.

Of the following gases, has density of 2.104 g/L at 303 K and 1.31 atm.

A sample of gas (1.3 mol) occupies L at 22 °C and 2.5 atm.

Of the following gases, will have the greatest rate of effusion at a given temperature.

CO (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0 °C. The partial pressure of CO2 in the container was _ atm.

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is If the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

A mixture of He and Ne at a total pressure of 0.95 atm is found to contain 0.32 mol of He and 0.56 mol of Ne. The partial pressure of Ne is atm.

According to the kinetic- molecular theory, molecules of different gases at the same temperature always have the same average kinetic energy.

A gas at a pressure of 325 torr exerts a force of N on an area of 5.5 m2.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

The total pressure exerted by a mixture of 1.50 g of H₂and 5.00 g of N₂in a 5.00- L vessel at 298 K is atm.

SO₂(5.00 g) and CO₂(5.00 g) were placed in a 750.0 mL container at 50.0 °C. The partial pressure of CO₂in the container was _ atm.

CO (5.00 g) and CO₂(5.00 g) were placed in a 750.0 mL container at 50.0 °C. The partial pressure of CO₂in the container was _ atm.

A gas at a pressure of 325 torr exerts a force of N on an area of 5.5 m².