Question 1

SO2 (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) 0.192 
B) 4.02 
C) 2.76 
D) 6.78 
E) 1.60 
A) 0.192 
B) 4.02 
C) 2.76 
D) 6.78 
E) 1.60

Question 2

Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a gas at room temperature?

Accepted Answer

A) Cl2 
B) HCl 
C) LiCl 
D) H2 
E) CH4 
A) Cl2 
B) HCl 
C) LiCl 
D) H2 
E) CH4

Question 3

A mixture of Xe, Kr, and Ar has a total pressure of 6.70 atm. What is the mole fraction of Kr if the partial pressures of Xe and Ar are 1.60 atm and 2.80 atm, respectively.

Accepted Answer

A) 0.174 
B) 0.256 
C) 0.343 
D) 0.481 
E) 0.570 
A) 0.174 
B) 0.256 
C) 0.343 
D) 0.481 
E) 0.570

Question 4

A balloon originally had a volume of 4.39 L at 44°C and a pressure of 729 torr. The balloon must be cooled to __________°C to reduce its volume to 3.78 L (at constant pressure).

Accepted Answer

A) 38.0 
B) 0.00 
C) 72.9 
D) 273 
E) 546 
A) 38.0 
B) 0.00 
C) 72.9 
D) 273 
E) 546

Question 5

Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn (s)+ H2SO4 (aq)→ ZnSO4 (aq)+ H2 (g)
In an experiment, 201 mL of wet H2 is collected over water at 27°C and a barometric pressure of 733 torr. The vapor pressure of water at 27°C is 26.74 torr. The partial pressure of hydrogen in this experiment is __________ atm.

Accepted Answer

A) 0.929 
B) 706 
C) 0.964 
D) 760 
E) 1.00 
A) 0.929 
B) 706 
C) 0.964 
D) 760 
E) 1.00

Question 6

At STP, the ratio of the root-mean-square speed of CO2 to that of SO2 is __________.

Accepted Answer

A) 2.001 
B) 2.119 
C) 1.000 
D) 1.207 
E) 1.456 
A) 2.001 
B) 2.119 
C) 1.000 
D) 1.207 
E) 1.456

Question 7

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

Accepted Answer

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

Question 8

A mixture of two gases was allowed to effuse from a container. One of the gases escaped from the container 1.43 times as fast as the other one. The two gases could have been __________.

Accepted Answer

A) CO and SF6 
B) O2 and Cl2 
C) CO and CO2 
D) Cl2 and SF6 
E) O2 and SF6 
A) CO and SF6 
B) O2 and Cl2 
C) CO and CO2 
D) Cl2 and SF6 
E) O2 and SF6

Question 9

In a Torricelli barometer, a pressure of one atmosphere supports a 760 mm column of mercury. If the original tube containing the mercury is replaced with a tube having twice the diameter of the original, the height of the mercury column at one atmosphere pressure is __________ mm.

Accepted Answer

A) 380 
B) 760 
C) 1.52 × 103 
D) 4.78 × 103 
E) 121 
A) 380 
B) 760 
C) 1.52 × 103 
D) 4.78 × 103 
E) 121

Question 10

How many moles of gas are there in a 45.0 L container at 25.0°C and 500.0 mm Hg?

Accepted Answer

A) 0.630 
B) 6.11 
C) 18.4 
D) 1.21 
E) 207 
A) 0.630 
B) 6.11 
C) 18.4 
D) 1.21 
E) 207

Question 11

A 0.325 L flask filled with gas at 0.851 atm and 19°C contains __________ mol of gas.

Accepted Answer

A) .0116 
B) .0148 
C) 9.42 
D) 12.4 
E) 80.7 
A) .0116 
B) .0148 
C) 9.42 
D) 12.4 
E) 80.7

Question 12

The volume of HCl gas required to react with excess magnesium metal to produce 6.82 L of hydrogen gas at 2.19 atm and 35.0°C is __________ L.

Accepted Answer

A) 6.82 
B) 2.19 
C) 13.6 
D) 4.38 
E) 3.41 
A) 6.82 
B) 2.19 
C) 13.6 
D) 4.38 
E) 3.41

Question 13

Which statement about atmospheric pressure is false?

Accepted Answer

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

Question 14

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.50 mol of chlorine gas at 0.00°C is __________ atm. (a = 6.49 L2-atm/mol2, b = 0.0562 L/mol)

Accepted Answer

A) 0.993 
B) 1.50 
C) 0.676 
D) 1.91 
E) 1.48 
A) 0.993 
B) 1.50 
C) 0.676 
D) 1.91 
E) 1.48

Question 15

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 mm Hg. Given that the density of mercury is 13.6 g/mL, the pressure of the enclosed gas is __________ atm.

Accepted Answer

A) 1.03 
B) 0.967 
C) 0.993 
D) 0.990 
E) 0.987 
A) 1.03 
B) 0.967 
C) 0.993 
D) 0.990 
E) 0.987

Question 16

A sample of a gas originally at 29°C and 1.25 atm pressure in a 3.0 L container is allowed to contract until the volume is 2.2 L and the temperature is 11°C. The final pressure of the gas is __________ atm.

Accepted Answer

A) 2.9 
B) 2.8 
C) 1.6 
D) 2.1 
E) 0.38 
A) 2.9 
B) 2.8 
C) 1.6 
D) 2.1 
E) 0.38

Question 17

The volume of hydrogen gas at 45.0°C and 699 torr that can be produced by the reaction of 5.66 g of zinc with excess sulfuric acid is __________ L.

Accepted Answer

A) 2.84 
B) 2.71 × 10-4 
C) 3.69 × 104 
D) 2.45 
E) 0.592 
A) 2.84 
B) 2.71 × 10-4 
C) 3.69 × 104 
D) 2.45 
E) 0.592

Question 18

The volume of 1.20 mol of gas at 61.3 kPa and 25.0°C is __________ L.

Accepted Answer

A) 135 
B) 48.5 
C) 52.4 
D) 108 
E) 55.7 
A) 135 
B) 48.5 
C) 52.4 
D) 108 
E) 55.7

Question 19

A sample of He gas (2.35 mol)occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample is __________ L at 423 K and 1.00 atm.

Accepted Answer

A) 0.709 
B) 41.1 
C) 81.6 
D) 1.41 
E) 57.9 
A) 0.709 
B) 41.1 
C) 81.6 
D) 1.41 
E) 57.9

Question 20

The volume of 0.65 mol of an ideal gas at 365 torr and 97°C is __________ L.

Accepted Answer

A) .054 
B) 9.5 
C) 11 
D) 41 
E) .024 
A) .054 
B) 9.5 
C) 11 
D) 41 
E) .024

Exam 10: Gases

SO2 (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.

Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a gas at room temperature?

A mixture of Xe, Kr, and Ar has a total pressure of 6.70 atm. What is the mole fraction of Kr if the partial pressures of Xe and Ar are 1.60 atm and 2.80 atm, respectively.

A balloon originally had a volume of 4.39 L at 44°C and a pressure of 729 torr. The balloon must be cooled to __________°C to reduce its volume to 3.78 L (at constant pressure).

At STP, the ratio of the root-mean-square speed of CO2 to that of SO2 is __________.

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

A mixture of two gases was allowed to effuse from a container. One of the gases escaped from the container 1.43 times as fast as the other one. The two gases could have been __________.

In a Torricelli barometer, a pressure of one atmosphere supports a 760 mm column of mercury. If the original tube containing the mercury is replaced with a tube having twice the diameter of the original, the height of the mercury column at one atmosphere pressure is __________ mm.

How many moles of gas are there in a 45.0 L container at 25.0°C and 500.0 mm Hg?

A 0.325 L flask filled with gas at 0.851 atm and 19°C contains __________ mol of gas.

The volume of HCl gas required to react with excess magnesium metal to produce 6.82 L of hydrogen gas at 2.19 atm and 35.0°C is __________ L.

Which statement about atmospheric pressure is false?

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.50 mol of chlorine gas at 0.00°C is __________ atm. (a = 6.49 L2-atm/mol2, b = 0.0562 L/mol)

A sample of a gas originally at 29°C and 1.25 atm pressure in a 3.0 L container is allowed to contract until the volume is 2.2 L and the temperature is 11°C. The final pressure of the gas is __________ atm.

The volume of hydrogen gas at 45.0°C and 699 torr that can be produced by the reaction of 5.66 g of zinc with excess sulfuric acid is __________ L.

The volume of 1.20 mol of gas at 61.3 kPa and 25.0°C is __________ L.

A sample of He gas (2.35 mol)occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample is __________ L at 423 K and 1.00 atm.

The volume of 0.65 mol of an ideal gas at 365 torr and 97°C is __________ L.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

SO₂ (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.

At STP, the ratio of the root-mean-square speed of CO₂ to that of SO₂ is __________.

Using the van der Waals equation, the pressure in a 22.4 L vessel containing 1.50 mol of chlorine gas at 0.00°C is __________ atm. (a = 6.49 L²-atm/mol², b = 0.0562 L/mol)