Question 1

The relationship between the "absolute temperature" on the Kelvin scale and the Celsius temperature is given by T(K) = 5/8[t(°C)] - 32

Accepted Answer

A) True 
 B)False  False

Question 2

At 27°C and 750 torr, both a 16 g sample of methane gas (CH4) and a 16 g sample of oxygen gas (O2) will have the same:

Accepted Answer

A)  average molecular velocities 
B)  average molecular kinetic energies 
C)  number of gaseous particles 
D)  total gaseous volumes 
E)  average effusion rates 
A)  average molecular velocities 
B)  average molecular kinetic energies 
C)  number of gaseous particles 
D)  total gaseous volumes 
E)  average effusion rates B

Question 3

Gas densities depend strongly on gas temperature and pressure.

Accepted Answer

A) True 
 B)False  True

Question 4

A 10.0 L container of unknown gas at 25.0°C contains 87.1 g of gas at 12.5 atm. What gas is in the container?

Accepted Answer

A)  NH3 
B)  C2H2 
C)  SO2 
D)  F2 
E)  NO2 
A)  NH3 
B)  C2H2 
C)  SO2 
D)  F2 
E)  NO2

Question 5

If someone were to light a cigar at one end of a closed room, persons at the other end of the room might soon perceive an odor due to gaseous emissions from the cigar. Such a phenomenon is an example of effusion.

Accepted Answer

A) True 
 B)False

Question 6

If 0.50 mole H2(g) and 1.0 mole He(g) are compared at standard temperature and pressure, the two gases will:

Accepted Answer

A)  have equal effusion rates 
B)  have equal average molecular velocities 
C)  have equal average molecular kinetic energies 
D)  occupy equal volumes 
E)  have equal weights 
A)  have equal effusion rates 
B)  have equal average molecular velocities 
C)  have equal average molecular kinetic energies 
D)  occupy equal volumes 
E)  have equal weights

Question 7

Diethyl ether was the first general anesthetic. It was first used in 1846 for surgical procedures. What is the molar mass of diethyl ether if 3.54 grams is 1.06 liters at 27°C and 1.11 atm?

Accepted Answer

A)  74.1 g/mol 
B)  6.67 g/mol 
C)  103 g/mol 
D)  91.3 g/mol 
E)  84.7 g/mol 
A)  74.1 g/mol 
B)  6.67 g/mol 
C)  103 g/mol 
D)  91.3 g/mol 
E)  84.7 g/mol

Question 8

What is the volume, in L, occupied by a mixture of 16.0 g Ne(g) and 42.0 g Ar(g) at 15.0 atm pressure and 25°C?

Accepted Answer

A)  94.6 L 
B)  3.01 L 
C)  1.71 L 
D)  1.29 L 
E)  0.252 L 
A)  94.6 L 
B)  3.01 L 
C)  1.71 L 
D)  1.29 L 
E)  0.252 L

Question 9

What volume of acetylene gas, C2H2, would be required at 0°C and 1 atm to obtain a 200.0 g C2H2 sample?

Accepted Answer

A)  4480 L 
B)  1.309 × 105 L 
C)  320.0 L 
D)  0.6304 L 
E)  172.1 L 
A)  4480 L 
B)  1.309 × 105 L 
C)  320.0 L 
D)  0.6304 L 
E)  172.1 L

Question 10

A gaseous mixture consists of 50.0% O2, 25.0% N2, and 25.0% Cl2, by mass. At standard temperature and pressure, the partial pressure of N2(g) is equal to 0.20 atm.

Accepted Answer

A) True 
 B)False

Question 11

A 50.0 mL canister of Freon-12 (CF2Cl2) was heated in boiling water (100.0°C) until the canister burst. If the canister was not defective, and had a burst rating of 103.4 bar, what minimum amount of Freon-12 was in the canister, assuming no volume change before bursting?

Accepted Answer

A)  9.63 g 
B)  11.5 g 
C)  20.0 g 
D)  27.5 g 
E)  75.0 g 
A)  9.63 g 
B)  11.5 g 
C)  20.0 g 
D)  27.5 g 
E)  75.0 g

Question 12

What pressure must be applied to N2(g) to obtain a density of 2.00 g/L at 25°C?

Accepted Answer

A)  1.75 atm 
B)  0.146 atm 
C)  111 atm 
D)  3.49 atm 
E)  2.29 atm 
A)  1.75 atm 
B)  0.146 atm 
C)  111 atm 
D)  3.49 atm 
E)  2.29 atm

Question 13

Diethyl ether (CH3CH2OCH2CH3) was the first general anesthetic. It was first used in 1846 for surgical procedures. What is the density in g/L of diethyl ether at 27°C and 1.11 atm?

Accepted Answer

A)  37.1 g/L 
B)  2.03 × 103 g/L 
C)  2.71 g/L 
D)  3.34 g/L 
E)  0.299 g/L 
A)  37.1 g/L 
B)  2.03 × 103 g/L 
C)  2.71 g/L 
D)  3.34 g/L 
E)  0.299 g/L

Question 14

Phosphine gas oxidizes spontaneously on exposure to air, as represented by: 2 PH3(g) + 3 O2(g) → P2O3(s) + 3 H2O(g)
What volume of oxygen gas, at 720 torr and 37°C, would be consumed in the formation of 22.0 g of P2O3 by this process?

Accepted Answer

A)  16.1 L 
B)  12.5 L 
C)  11.2 L 
D)  8.05 L 
E)  1.92 L 
A)  16.1 L 
B)  12.5 L 
C)  11.2 L 
D)  8.05 L 
E)  1.92 L

Question 15

The volume correction term in the van der Waals equation is present because:

Accepted Answer

A)  barometers are inaccurate 
B)  molecules are diatomic 
C)  molecules attract each other 
D)  molecules occupy volume 
E)  molecules repel each other 
A)  barometers are inaccurate 
B)  molecules are diatomic 
C)  molecules attract each other 
D)  molecules occupy volume 
E)  molecules repel each other

Question 16

According to the kinetic-molecular theory of gases, at constant temperature, all particles have equal translational kinetic energy.

Accepted Answer

A) True 
 B)False

Question 17

When 8.21 L of C3H8(g) burn in oxygen, how many liters of oxygen are consumed? All gas volumes are measured at the same temperature and pressure but not at STP.

Accepted Answer

A)  57.5 L 
B)  41.1 L 
C)  1.17 L 
D)  1.64 L 
E)  23.7 L 
A)  57.5 L 
B)  41.1 L 
C)  1.17 L 
D)  1.64 L 
E)  23.7 L

Question 18

What is the density of carbon dioxide gas at -15°C and 728 torr?

Accepted Answer

A)  2.17 g L-1 
B)  2.08 g L-1 
C)  1.99 g L-1 
D)  1.84 g L-1 
E)  1.27 g L-1 
A)  2.17 g L-1 
B)  2.08 g L-1 
C)  1.99 g L-1 
D)  1.84 g L-1 
E)  1.27 g L-1

Question 19

Butane (C4H10) is used as a fuel where natural gas is not available. How many grams of butane will fill a 3.50 liter container at 35.6°C and 758 torr?

Accepted Answer

A)  0.138 g 
B)  69.5 g 
C)  422 g 
D)  8.01 g 
E)  0.0105 g 
A)  0.138 g 
B)  69.5 g 
C)  422 g 
D)  8.01 g 
E)  0.0105 g

Question 20

The complete combustion of octane, a component of gasoline, is represented by the equation: 2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)
How many liters of CO2(g), measured at 63.1°C and 688 mmHg, are produced for every gallon of octane burned? (1 gal = 3.785 L; density of C8H18(l) = 0.703 g/mL)

Accepted Answer

A)  7.48 L 
B)  7.11 × 102 L 
C)  5.68 × 103 L 
D)  5.68 L 
E)  1.07 × 103 L 
A)  7.48 L 
B)  7.11 × 102 L 
C)  5.68 × 103 L 
D)  5.68 L 
E)  1.07 × 103 L

Exam 6: Gases

The relationship between the "absolute temperature" on the Kelvin scale and the Celsius temperature is given by T(K) = 5/8[t(°C)] - 32

At 27°C and 750 torr, both a 16 g sample of methane gas (CH4) and a 16 g sample of oxygen gas (O2) will have the same:

Gas densities depend strongly on gas temperature and pressure.

A 10.0 L container of unknown gas at 25.0°C contains 87.1 g of gas at 12.5 atm. What gas is in the container?

If someone were to light a cigar at one end of a closed room, persons at the other end of the room might soon perceive an odor due to gaseous emissions from the cigar. Such a phenomenon is an example of effusion.

If 0.50 mole H2(g) and 1.0 mole He(g) are compared at standard temperature and pressure, the two gases will:

Diethyl ether was the first general anesthetic. It was first used in 1846 for surgical procedures. What is the molar mass of diethyl ether if 3.54 grams is 1.06 liters at 27°C and 1.11 atm?

What is the volume, in L, occupied by a mixture of 16.0 g Ne(g) and 42.0 g Ar(g) at 15.0 atm pressure and 25°C?

What volume of acetylene gas, C2H2, would be required at 0°C and 1 atm to obtain a 200.0 g C2H2 sample?

A gaseous mixture consists of 50.0% O2, 25.0% N2, and 25.0% Cl2, by mass. At standard temperature and pressure, the partial pressure of N2(g) is equal to 0.20 atm.

A 50.0 mL canister of Freon-12 (CF2Cl2) was heated in boiling water (100.0°C) until the canister burst. If the canister was not defective, and had a burst rating of 103.4 bar, what minimum amount of Freon-12 was in the canister, assuming no volume change before bursting?

What pressure must be applied to N2(g) to obtain a density of 2.00 g/L at 25°C?

Diethyl ether (CH3CH2OCH2CH3) was the first general anesthetic. It was first used in 1846 for surgical procedures. What is the density in g/L of diethyl ether at 27°C and 1.11 atm?

Phosphine gas oxidizes spontaneously on exposure to air, as represented by: 2 PH3(g) + 3 O2(g) → P2O3(s) + 3 H2O(g) What volume of oxygen gas, at 720 torr and 37°C, would be consumed in the formation of 22.0 g of P2O3 by this process?

The volume correction term in the van der Waals equation is present because:

According to the kinetic-molecular theory of gases, at constant temperature, all particles have equal translational kinetic energy.

When 8.21 L of C3H8(g) burn in oxygen, how many liters of oxygen are consumed? All gas volumes are measured at the same temperature and pressure but not at STP.

What is the density of carbon dioxide gas at -15°C and 728 torr?

Butane (C4H10) is used as a fuel where natural gas is not available. How many grams of butane will fill a 3.50 liter container at 35.6°C and 758 torr?

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

At 27°C and 750 torr, both a 16 g sample of methane gas (CH₄) and a 16 g sample of oxygen gas (O₂) will have the same:

If 0.50 mole H₂(g) and 1.0 mole He(g) are compared at standard temperature and pressure, the two gases will:

What volume of acetylene gas, C₂H₂, would be required at 0°C and 1 atm to obtain a 200.0 g C₂H₂ sample?

A gaseous mixture consists of 50.0% O₂, 25.0% N₂, and 25.0% Cl₂, by mass. At standard temperature and pressure, the partial pressure of N₂(g) is equal to 0.20 atm.

A 50.0 mL canister of Freon-12 (CF₂Cl₂) was heated in boiling water (100.0°C) until the canister burst. If the canister was not defective, and had a burst rating of 103.4 bar, what minimum amount of Freon-12 was in the canister, assuming no volume change before bursting?

What pressure must be applied to N₂(g) to obtain a density of 2.00 g/L at 25°C?

Diethyl ether (CH₃CH₂OCH₂CH₃) was the first general anesthetic. It was first used in 1846 for surgical procedures. What is the density in g/L of diethyl ether at 27°C and 1.11 atm?

Phosphine gas oxidizes spontaneously on exposure to air, as represented by: 2 PH₃(g) + 3 O₂(g) → P₂O₃(s) + 3 H₂O(g) What volume of oxygen gas, at 720 torr and 37°C, would be consumed in the formation of 22.0 g of P₂O₃ by this process?

When 8.21 L of C₃H₈(g) burn in oxygen, how many liters of oxygen are consumed? All gas volumes are measured at the same temperature and pressure but not at STP.

Butane (C₄H₁₀) is used as a fuel where natural gas is not available. How many grams of butane will fill a 3.50 liter container at 35.6°C and 758 torr?