Question 1

In ideal gas equation calculations, expressing pressure in Pascals (Pa), necessitates the use of the gas constant, R, equal to ________.

Accepted Answer

A) 0.08206 atm L mol-1K-1 
B) 8.314   -Pa/mol-K 
C) 62.36 L torr mol-1K-1 
D) 1.987 cal mol-1K-1 
E) none of the above 
A) 0.08206 atm L mol-1K-1 
B) 8.314   -Pa/mol-K 
C) 62.36 L torr mol-1K-1 
D) 1.987 cal mol-1K-1 
E) none of the above

Question 2

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

Accepted Answer

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

Question 3

A sample of a gas (5.0 mol)at 1.0 atm is expanded at constant temperature from 10 L to 15 L. The final pressure is ________ atm.

Accepted Answer

A) 1.5 
B) 7.5 
C) 0.67 
D) 3.3 
E) 15 
A) 1.5 
B) 7.5 
C) 0.67 
D) 3.3 
E) 15

Question 4

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 5

The density of chlorine (Cl2)gas at 25 °C and 60. kPa is ________ g/L.

Accepted Answer

A) 20 
B) 4.9 
C) 1.7 
D) 0.86 
E) 0.58 
A) 20 
B) 4.9 
C) 1.7 
D) 0.86 
E) 0.58

Question 6

A sample of gas (24.2 g)initially at 4.00 atm was compressed from 8.00 L to 2.00 L at constant temperature. After the compression, the gas pressure was ________ atm.

Accepted Answer

A) 4.00 
B) 2.00 
C) 1.00 
D) 8.00 
E) 16.0 
A) 4.00 
B) 2.00 
C) 1.00 
D) 8.00 
E) 16.0

Question 7

A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ne is 2.75 atm, how many moles of Ar are in the mixture?

Accepted Answer

A) 11.0 
B) 5.00 
C) 6.75 
D) 9.25 
E) 12.0 
A) 11.0 
B) 5.00 
C) 6.75 
D) 9.25 
E) 12.0

Question 8

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

Accepted Answer

A) 0.0116 
B) 0.0148 
C) 9.42 
D) 12.4 
E) 80.7 
A) 0.0116 
B) 0.0148 
C) 9.42 
D) 12.4 
E) 80.7

Question 9

A sample of an unknown volatile liquid was injected into a Dumas flask mflask = 27.0928 g, vflask = 0.1040 L)and heated until no visible traces of the liquid could be found. The flask and its contents were then rapidly cooled and reweighed (mflask + vapor = 27.4593 g). The atmospheric pressure and temperature during the experiment were 0.976 atm and 18.0 °C, respectively. The unknown volatile liquid was ________.

Accepted Answer

A) C6H12 
B) C6H14 
C) C7H14 
D) C7H16 
E) C6H6 
A) C6H12 
B) C6H14 
C) C7H14 
D) C7H16 
E) C6H6

Question 10

10.0 grams of argon and 20.0 grams of neon are placed in a 1216.1 ml container at 25.1 °C. The partial pressure of neon is ________ atm.

Accepted Answer

A) 19.9 
B) 5.03 
C) 1.68 
D) 20.0 
E) 49.1 
A) 19.9 
B) 5.03 
C) 1.68 
D) 20.0 
E) 49.1

Question 11

A gas in a 325 mL container has a pressure of 695 torr at 19 °C. There are ________ mol of gas in the flask.

Accepted Answer

A) 1.24 × 10-2 
B) 1.48 × 10-2 
C) 9.42 
D) 12.4 
E) 80.6 
A) 1.24 × 10-2 
B) 1.48 × 10-2 
C) 9.42 
D) 12.4 
E) 80.6

Question 12

The volume of 1.26 mol of gas at 69.4 kPa and 25.30 °C is ________ L.

Accepted Answer

A) 45.1 
B) 633 
C) 3.82 
D) 0.445 
E) 0.439 
A) 45.1 
B) 633 
C) 3.82 
D) 0.445 
E) 0.439

Question 13

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

Question 14

The density of NO2 in a 4.50 L tank at 760.0 torr and 25.0 °C is ________ g/L.

Accepted Answer

A) 1.64 
B) 9.30 
C) 1.68 
D) 1.88 
E) 3.27 
A) 1.64 
B) 9.30 
C) 1.68 
D) 1.88 
E) 3.27

Question 15

When gases are treated as real, via use of the van der Waals equation, the actual volume occupied by gas molecules ________ the pressure exerted and the attractive forces between gas molecules ________ the pressure exerted, as compared to an ideal gas.

Accepted Answer

A) decreases, increases 
B) increases, increases 
C) increases, decreases 
D) does not affect, decreases 
E) does not affect, increases 
A) decreases, increases 
B) increases, increases 
C) increases, decreases 
D) does not affect, decreases 
E) does not affect, increases

Question 16

A gas is considered "ideal" if one mole of it in a one-liter container exerts a pressure of exactly 1 atm at room temperature.

Accepted Answer

A) True 
 B)False

Question 17

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 25.0 °C and 1.50 atm. The reaction of 7.75 kg of bicarbonate with excess hydrochloric acid under these conditions will produce ________ L of CO2.

Accepted Answer

A) 1.82 × 103 
B) 2.85 × 104 
C) 1.82 × 104 
D) 1.50 × 103 
E) 8.70 × 102 
A) 1.82 × 103 
B) 2.85 × 104 
C) 1.82 × 104 
D) 1.50 × 103 
E) 8.70 × 102

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

The van der Waals equation for real gases recognizes that ________.

Accepted Answer

A) gas particles have non-zero volumes and interact with each other 
B) molar volumes of gases of different types are different 
C) the non-zero volumes of gas particles effectively decrease the amount of "empty space" between them 
D) the molecular attractions between particles of gas decreases the pressure exerted by the gas 
E) all of the above statements are true 
A) gas particles have non-zero volumes and interact with each other 
B) molar volumes of gases of different types are different 
C) the non-zero volumes of gas particles effectively decrease the amount of "empty space" between them 
D) the molecular attractions between particles of gas decreases the pressure exerted by the gas 
E) all of the above statements are true

Question 20

Gaseous mixtures ________.

Accepted Answer

A) can only contain molecules 
B) are all heterogeneous 
C) can only contain isolated atoms 
D) are all homogeneous 
E) must contain both isolated atoms and molecules 
A) can only contain molecules 
B) are all heterogeneous 
C) can only contain isolated atoms 
D) are all homogeneous 
E) must contain both isolated atoms and molecules

Exam 10: Gases

In ideal gas equation calculations, expressing pressure in Pascals (Pa), necessitates the use of the gas constant, R, equal to ________.

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

A sample of a gas (5.0 mol)at 1.0 atm is expanded at constant temperature from 10 L to 15 L. The final pressure is ________ atm.

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.

The density of chlorine (Cl2)gas at 25 °C and 60. kPa is ________ g/L.

A sample of gas (24.2 g)initially at 4.00 atm was compressed from 8.00 L to 2.00 L at constant temperature. After the compression, the gas pressure was ________ atm.

A gas mixture of Ne and Ar has a total pressure of 4.00 atm and contains 16.0 mol of gas. If the partial pressure of Ne is 2.75 atm, how many moles of Ar are in the mixture?

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

10.0 grams of argon and 20.0 grams of neon are placed in a 1216.1 ml container at 25.1 °C. The partial pressure of neon is ________ atm.

A gas in a 325 mL container has a pressure of 695 torr at 19 °C. There are ________ mol of gas in the flask.

The volume of 1.26 mol of gas at 69.4 kPa and 25.30 °C is ________ L.

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 density of NO2 in a 4.50 L tank at 760.0 torr and 25.0 °C is ________ g/L.

When gases are treated as real, via use of the van der Waals equation, the actual volume occupied by gas molecules ________ the pressure exerted and the attractive forces between gas molecules ________ the pressure exerted, as compared to an ideal gas.

A gas is considered "ideal" if one mole of it in a one-liter container exerts a pressure of exactly 1 atm at room temperature.

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 25.0 °C and 1.50 atm. The reaction of 7.75 kg of bicarbonate with excess hydrochloric acid under these conditions will produce ________ L of CO2.

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

The van der Waals equation for real gases recognizes that ________.

Gaseous mixtures ________.

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

The density of chlorine (Cl₂)gas at 25 °C and 60. kPa is ________ g/L.

The density of NO₂ in a 4.50 L tank at 760.0 torr and 25.0 °C is ________ g/L.

When gases are treated as real, via use of the van der Waals equation, the actual volume occupied by gas molecules the pressure exerted and the attractive forces between gas molecules the pressure exerted, as compared to an ideal gas.

Sodium bicarbonate is reacted with concentrated hydrochloric acid at 25.0 °C and 1.50 atm. The reaction of 7.75 kg of bicarbonate with excess hydrochloric acid under these conditions will produce ________ L of CO₂.