Question 1

The volume occupied by 1.5 mol of gas at 35 °C and 2.0 atm pressure is L.

Accepted Answer

A)  19 
B)  38 
C)  2.2 
D)  0.026 
E)  0.053 
A)  19 
B)  38 
C)  2.2 
D)  0.026 
E)  0.053

Question 2

The amount of gas that occupies 60.82 L at 31 °C and 367 mmHg is mol.

Accepted Answer

A)  894 
B)  0.120 
C)  0.850 
D)  11.6 
E)  1.18 
A)  894 
B)  0.120 
C)  0.850 
D)  11.6 
E)  1.18

Question 3

A sample of oxygen gas was found to effuse at a rate equal to two times that of an unknown gas. The molecular weight of the unknown gas is g/mol.

Accepted Answer

A)  8.0 
B)  8 
C)  16 
D)  64 
E)  128 
A)  8.0 
B)  8 
C)  16 
D)  64 
E)  128

Question 4

A gas originally at 27 °C and 1.00 atm pressure in a 3.9 L flask is cooled at constant pressure until the temperature is 11 °C. The new volume of the gas is L.

Accepted Answer

A)  3.7 
B)  0.27 
C)  0.24 
D)  4.1 
E)  3.9 
A)  3.7 
B)  0.27 
C)  0.24 
D)  4.1 
E)  3.9

Question 5

The National Weather Service routinely supplies atmospheric pressure data to help pilots set their altimeters. The units the NWS uses for atmospheric pressure are inches of mercury. A barometric pressure of 30.51 inches of mercury corresponds to kPa.

Accepted Answer

A)  1.020 
B)  16.01 
C)  77.50 
D)  103.3 
E)  775 
A)  1.020 
B)  16.01 
C)  77.50 
D)  103.3 
E)  775

Question 6

The density of air at STP is 1.285 g/L. Which of the following cannot be used to fill a balloon that will float in air at STP?

Accepted Answer

A)  NH3  
B)  NO 
C)  Ne 
D)  HF 
E)  CH4 
A)  NH3  
B)  NO 
C)  Ne 
D)  HF 
E)  CH4

Question 7

The molecular weight of a gas that has a density of 6.70 g/L at STP is g/mol.

Accepted Answer

A)  150 
B)  0.298 
C)  496 
D)  73.0 
E)  3.35 
A)  150 
B)  0.298 
C)  496 
D)  73.0 
E)  3.35

Question 8

According to kinetic- molecular theory, in which of the following gases will the root- mean- square speed of the molecules be the highest at 200 °C?

Accepted Answer

A)  HCl 
B)  Cl2 
C)  SF6 
D)  H2O 
E)  None. The molecules of all gases have the same root- mean- square speed at any given temperature. 
A)  HCl 
B)  Cl2 
C)  SF6 
D)  H2O 
E)  None. The molecules of all gases have the same root- mean- square speed at any given temperature.

Question 9

The density of nitric oxide (NO) gas at 1.21 atm and 54.1 °C is g/L.

Accepted Answer

A)  1.35 
B)  0.0451 
C)  0.273 
D)  8.2 
E)  0.740 
A)  1.35 
B)  0.0451 
C)  0.273 
D)  8.2 
E)  0.740

Question 10

If 3.21 mol of a gas occupies 56.2 L at 44 °C and 793 torr, 5.29 mol of this gas occupies L under these conditions.

Accepted Answer

A)  478 
B)  14.7 
C)  92.6 
D)  61.7 
E)  30.9 
A)  478 
B)  14.7 
C)  92.6 
D)  61.7 
E)  30.9

Question 11

The reaction of 50 mL of N2 gas with 150 mL of H2 gas to form ammonia via the equation:
N2 (g) + 3H2 (g) - 2NH3 (g)
Will produce mL of ammonia if pressure and temperature are kept constant.

Accepted Answer

A)  250 
B)  200 
C)  50 
D)  100 
E)  150 
A)  250 
B)  200 
C)  50 
D)  100 
E)  150

Question 12

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

Accepted Answer

A)  1.60 
B)  10.3 
C)  6.31 
D)  0.292 
E)  4.02 
A)  1.60 
B)  10.3 
C)  6.31 
D)  0.292 
E)  4.02

Question 13

Which statement about atmospheric pressure is false?

Accepted Answer

A)  With an increase in altitude, atmospheric pressure increases as well. 
B)  Atmospheric pressure prevents water in lakes, rivers, and oceans from boiling away. 
C)  As air becomes thinner, its density decreases. 
D)  The warmer the air, the lower the atmospheric pressure. 
E)  Air actually has weight. 
A)  With an increase in altitude, atmospheric pressure increases as well. 
B)  Atmospheric pressure prevents water in lakes, rivers, and oceans from boiling away. 
C)  As air becomes thinner, its density decreases. 
D)  The warmer the air, the lower the atmospheric pressure. 
E)  Air actually has weight.

Question 14

A gas vessel is attached to an open- end manometer containing a nonvolatile liquid of density 0.791 g/mL as shown below.
 
The difference in heights of the liquid in the two sides of the manometer is 43.4 cm when the atmospheric pressure is 755 mmHg. Given that the density of mercury is 13.6 g/mL, the pressure of the enclosed gas is atm.

Accepted Answer

A)  0.993 
B)  1.03 
C)  0.987 
D)  0.960 
E)  0.990 
A)  0.993 
B)  1.03 
C)  0.987 
D)  0.960 
E)  0.990

Question 15

What is the density (in g/L) of oxygen gas at 77 oC and 700 torr?

Accepted Answer

Question 16

A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. A sample weighing 9.49 g occupies _ L at 353 K and 2.00 atm.

Accepted Answer

A)  109 
B)  147 
C)  77.3 
D)  68.2 
E)  54.7 
A)  109 
B)  147 
C)  77.3 
D)  68.2 
E)  54.7

Question 17

The molecular weight of a gas that has a density of 5.75 g/L at STP is g/mol.

Accepted Answer

A)  3.90 
B)  129 
C)  578 
D)  1.73 × 10- 3 
E)  141 
A)  3.90 
B)  129 
C)  578 
D)  1.73 × 10- 3 
E)  141

Question 18

Kinetic- molecular theory assumes that attractive and repulsive forces between gas particles are stronger than those between gas particles and container walls.

Accepted Answer

A) True 
 B)False

Question 19

At a temperature of _ °C, 0.444 mol of CO gas occupies 11.8 L at 889 torr.

Accepted Answer

A)  379 
B)  14 
C)  73 
D)  32 
E)  106 
A)  379 
B)  14 
C)  73 
D)  32 
E)  106

Question 20

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at 100 °C is atm. (a = 0.211 L2- atm/mol2, b = 0.0171 L/mol)

Accepted Answer

A)  1.00 
B)  0.730 
C)  1.21 
D)  1.37 
E)  0.367 
A)  1.00 
B)  0.730 
C)  1.21 
D)  1.37 
E)  0.367

Exam 10: Gases

The volume occupied by 1.5 mol of gas at 35 °C and 2.0 atm pressure is L.

The amount of gas that occupies 60.82 L at 31 °C and 367 mmHg is mol.

A sample of oxygen gas was found to effuse at a rate equal to two times that of an unknown gas. The molecular weight of the unknown gas is g/mol.

A gas originally at 27 °C and 1.00 atm pressure in a 3.9 L flask is cooled at constant pressure until the temperature is 11 °C. The new volume of the gas is L.

The National Weather Service routinely supplies atmospheric pressure data to help pilots set their altimeters. The units the NWS uses for atmospheric pressure are inches of mercury. A barometric pressure of 30.51 inches of mercury corresponds to kPa.

The density of air at STP is 1.285 g/L. Which of the following cannot be used to fill a balloon that will float in air at STP?

The molecular weight of a gas that has a density of 6.70 g/L at STP is g/mol.

According to kinetic- molecular theory, in which of the following gases will the root- mean- square speed of the molecules be the highest at 200 °C?

The density of nitric oxide (NO) gas at 1.21 atm and 54.1 °C is g/L.

If 3.21 mol of a gas occupies 56.2 L at 44 °C and 793 torr, 5.29 mol of this gas occupies L under these conditions.

The reaction of 50 mL of N2 gas with 150 mL of H2 gas to form ammonia via the equation: N2 (g) + 3H2 (g) - 2NH3 (g) Will produce mL of ammonia if pressure and temperature are kept constant.

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

Which statement about atmospheric pressure is false?

What is the density (in g/L) of oxygen gas at 77 oC and 700 torr?

A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. A sample weighing 9.49 g occupies _ L at 353 K and 2.00 atm.

The molecular weight of a gas that has a density of 5.75 g/L at STP is g/mol.

Kinetic- molecular theory assumes that attractive and repulsive forces between gas particles are stronger than those between gas particles and container walls.

At a temperature of _ °C, 0.444 mol of CO gas occupies 11.8 L at 889 torr.

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at 100 °C is atm. (a = 0.211 L2- atm/mol2, b = 0.0171 L/mol)

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 reaction of 50 mL of N₂gas with 150 mL of H₂gas to form ammonia via the equation: N₂(g) + 3H₂(g) - 2NH₃(g) Will produce mL of ammonia if pressure and temperature are kept constant.

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

What is the density (in g/L) of oxygen gas at 77 ^oC and 700 torr?

A sample of H₂gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. A sample weighing 9.49 g occupies _ L at 353 K and 2.00 atm.

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.00 mol of neon gas at 100 °C is atm. (a = 0.211 L²- atm/mol², b = 0.0171 L/mol)