51) Find the number of liters occupied by 3.0 moles of nitrogen gas at STP.
A) 67 L
B) 7.5 L
C) 4.8 L
D) 0.13 L
52) Find the number of liters occupied by 3.0 g of nitrogen gas at STP.
A) 67 L
B) 7.5 L
C) 2.4 L
D) 0.13 L
53) Which statement is not true about an ideal gas?
A) Ideal gas molecules travel in a straight line.
B) Molecular collisions are elastic.
C) The intermolecular forces in gas molecules are very weak except when they collide.
D) Higher temperatures slow down the speed of the molecules.
54) The number of moles of oxygen that are present in a 15-L container at STP is ________.
A) 0.1
B) 0.67
C) 0.89
D) 336
55) 14.0 g of nitrogen gas will occupy ________ at STP.
A) 1.12 L
B) 2.24 L
C) 11.2 L
D) 22.4 L
56) 88.0 g of carbon dioxide gas will occupy ________ at STP.
A) 11.2 L
B) 22.4 L
C) 44.8 L
D) 67.2 L
57) 3.01 × 1023 molecules of methane gas will occupy ________ at STP.
A) 11.2 L
B) 22.4 L
C) 44.8 L
D) 67.2 L
58) The density of hydrogen gas at STP is ________.
A) 0.045 g/L
B) 0.090 g/L
C) 0.180 g/L
D) 0.360 g/mL
11.2 True/False Questions
1) The atmospheric pressure increases as an airplane increases in altitude.
2) At sea level, if a low pressure system comes through then the atmospheric pressure is below
760 mm Hg.
3) Ideal gas molecules undergo non-elastic collisions.
4) The term elastic indicates that no kinetic energy is transferred during a collision.
5) The pressure of 2.00 atm is equal to 152 cm Hg.
6) The pressure of 0.500 atm is equal to 0.500 mm Hg.
7) In the Ideal gas law, temperature is measured in K.
8) 1 torr is equal to 1 cm Hg. 1 atm = 760 torr.
9) 76 cm Hg is equal to 1 atm.
10) 0.0309 atm is equal to 23.5 cm Hg.
11) 947 mbar is equal to 0.933 atm. 1 atm= 1.015 bar.
12) 124 cm Hg is equal to 1.63 atm.
13) 30.19 inches of Hg is equal to 1.009 atm.
14) As temperature increases the volume of a gas increases, even if the pressure is not kept
constant.
15) As the volume of a gas is allowed to double, its pressure is halved as long as the temperature
is kept constant.
16) As the temperature of a gas increases, its pressure increases as long as the volume is kept
constant.
17) Increasing the temperature of a gas from 100 K to 200 K will cause the volume to double.
18) Increasing the temperature of a gas from 100 °C to 200 °C will cause the volume to double.
19) One of the assumptions taken when dealing with ideal gas law is that most volume occupied
by a gas is actually empty space.
20) The typical units for the density of gases are g/L.
21) The molar volume of any gas is equal to 22.4 L at any temperature.
22) The molar volume of any gas whether diatomic or monatomic is 22.4 L at STP.
23) The molar volume of 32 g of oxygen gas is 22.4 L at STP.
24) The molar volume of water vapor at its boiling point is 22.4 L.
25) The density of nitrogen is equal to that of carbon monoxide at STP.
26) The density of methane is equal to the density of oxygen under the same conditions.
27) The ideal gas law may be applied also to a mixture of gases.
28) The density of a gas is independent of temperature.
11.3 Matching Questions
Match each set of two variables of an ideal gas that appears in the left column with the
corresponding relationship (proportional or inversely proportional) that appears in the right
column.
A) proportional
B) inversely proportional
1) pressure and volume
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
2) pressure and temperature
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
3) volume and temperature
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
4) volume and number of moles
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
5) pressure and number of moles
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
Match the event that appears in the left column to the corresponding consequence that appears
in the right column.
A) pressure decreases
B) volume decreases
C) volume increases
D) temperature decreases
E) pressure increases
F) temperature increases
6) At constant temperature, as pressure increases, ________.
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
7) At constant temperature, as volume decreases, ________.
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
8) At constant pressure, as volume increases, ________.
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
9) At constant pressure, as temperature increases, ________.
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
10) At constant volume, as pressure decreases, ________.
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
11) At constant volume, as temperature decreases, ________.
Section: Section 11.2
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
Match the event that appears in the left column to the corresponding consequence that appears
in the right column.
A) the density increases
B) the pressure increases
C) the pressure decreases
D) the density decreases
12) At constant pressure and temperature, as the molecular mass of a gas decreases, ________.
Section: Section 11.3
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
13) At constant temperature and for the same gas, as density increases, ________.
Section: Section 11.3
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
14) At constant pressure and for the same gas, as the T decreases, ________.
Section: Section 11.3
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
15) At constant temperature and for the same gas, as density decreases, ________.
Section: Section 11.3
Learning Outcome: 11.2 Describe the relationship between any two variables that characterize a
gas are related when the remaining variables are held constant.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
Match each gas that appears in the left column with its corresponding density, at STP, that
appears in the right column.
A) 0.900 g/L
B) 2.86 g/ L
C) 1.43 g/L
D) 3.93 g/L
E) 1.34 g/L
F) 0.760 g/ L
16) ethane, C2H6
Section: Section 11.3
Learning Outcome: 11.5 Calculate the density of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
17) sulfur dioxide
Section: Section 11.3
Learning Outcome: 11.5 Calculate the density of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
18) ammonia
Section: Section 11.3
Learning Outcome: 11.5 Calculate the density of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
19) neon
Section: Section 11.3
Learning Outcome: 11.5 Calculate the density of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
20) carbon tetrafluoride
Section: Section 11.3
Learning Outcome: 11.5 Calculate the density of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
21) oxygen
Section: Section 11.3
Learning Outcome: 11.5 Calculate the density of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
Match the volumes that appear in the left column with the other variables that appear in the
right column.
A) 40.0 g of fluorine gas at STP
B) 40.0 g of fluorine gas at 900 torr and 298 K
C) 48.0 g ozone at STP
D) 3.9 g helium gas at -20 °C and 800 mm Hg
E) 16.0 g oxygen gas at STP
F) 0.30 moles of methane gas at STP
22) 6.72 L occupied by ________.
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
23) 19.2 L occupied by ________.
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
24) 11.2 L occupied by ________.
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
25) 22.4 L occupied by ________.
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
26) 23.6 L occupied by ________.
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
27) 21.7 L occupied by ________.
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
Match the number of moles represented in the left column with each of the following quantities of
substances, measured at STP.
A) 12.1 L of neon gas
B) 32.0 g of oxygen gas
C) 44.8 L of ammonia gas
D) 3.00 liters of acetylene
E) 16.0 g of oxygen gas
28) 0.540 moles
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
29) 1.00 mole
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
30) 0.500 mole
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
31) 2.00 moles
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
32) 0.134 moles
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.