Full file at
Introductory Chemistry: Atoms First
Chapter 11 What If There Were No Intermolecular Forces? - The Ideal Gas
11.1 Multiple Choice Questions
1) Pressure is defined as ______.
A) the amount of force per unit area
B) the amount of force per unit volume
C) the amount of work per unit area
D) the amount of work per unit volume
Answer: A
Section: Section 11.1
Learning Outcome: 11.1 Describe the units of pressure and how pressure is created by a gas.
Global Obj: G1 Demonstrate an understanding of the principles of scientific inquiry.
2) 1 atm is equal to ______. 1 atm = 760 torr.
A) 760 cm Hg
B) 760 mm Hg
C) 76 torr
D) 76 mm Hg
Answer: B
Section: Section 11.1
Learning Outcome: 11.1 Describe the units of pressure and how pressure is created by a gas.
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
3) 0.15 atm is equal to ______. 1 atm = 760 torr.
A) 11.4 torr
B) 114 torr
C) 1.14 × 10-5 torr
D) 1.14 × 10-3 torr
Answer: B
Section: Section 11.1
Learning Outcome: 11.1 Describe the units of pressure and how pressure is created by a gas.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
4) 380 mm Hg is equal to ______atm.
A) 0.50
B) 2.0
C) 5.0
D) 20.0
Answer: A
Section: Section 11.1
Learning Outcome: 11.1 Describe the units of pressure and how pressure is created by a gas.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
5) 855 torr is equal to ______cm Hg. 1 atm = 760 torr.
A) 1.13
B) 85.5
C) 855
D) 8550
Answer: B
Section: Section 11.1
Learning Outcome: 11.1 Describe the units of pressure and how pressure is created by a gas.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
6) A pressure of 76.0 cm Hg would be equivalent to what height of a water column? The density of mercury = 13.6 g/mL.
A) 5.59 cm
B) 55.9 cm
C) 0.18 cm
D) 1030 cm
Answer: D
Section: Section 11.1
Learning Outcome: 11.1 Describe the units of pressure and how pressure is created by a gas.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
7) The value of the gas constant R is equal to ______L∙atm/ K∙mole.
A) 0.0821
B) 8.21
C) 82.1
D) 0.00821
Answer: A
Section: Section 11.2
Global Obj: G2 Demonstrate the ability to think critically and employ critical thinking skills.
8) If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change?
A) 2
B) 1/2
C) 1/4
D) 1/8
Answer: B
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
9) A gas under an initial pressure of 0.60 atm is compressed at constant temperature from 27 L to 3.0 L. The final pressure becomes ______.
A) 0.060 atm
B) 0.54 atm
C) 5.4 atm
D) 54 atm
Answer: C
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
10) How many moles of gas are found in a container that occupies a volume of 5.50 L with a pressure of 0.335 atm at
A) 0.0753 moles
B) 0.898 moles
C) 13.3 moles
D) 1.11 moles
Answer: A
Section: Section 11.2
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
11) The number of moles of hydrogen gas present in a 1,500 mL container at 298 K and 2.0 atm pressure is ______.
A) 0.65 moles
B) 0.12 moles
C) 0.26 moles
D) 0.52 moles
Answer: B
Section: Section 11.2
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
12) For an ideal gas, which pairs of the variables below are inversely proportional to each assuming all other variables are kept constant?
A) P and n
B) V and T
C) V and P
D) V and n
Answer: C
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.
13) For an ideal gas, which pairs of the variables below are directly proportional to each assuming all other variables are kept constant?
A) P and n
B) n and T
C) V and P
D) all of the above
Answer: A
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.
14) A fixed amount of a gas has both its temperature and volume doubled. What happens to its pressure?
A) It doubles.
B) It is halved.
C) It quadruples.
D) It remains the same.
Answer: D
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
15) Imagine a balloon that you blow up to a full size. What do you expect to happen if you pour liquid nitrogen at 77 K over the surface of the balloon? Assume that the pressure does not change significantly.
A) increase slightly in size
B) decrease significantly in size
C) stay exactly the same size as before
D) One cannot say unless the composition of the gas is known.
Answer: B
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
16) Imagine a balloon that you blow up to a full size. What do you expect to happen if you suspend the balloon over a bunsen burner? Assume that the pressure does not change significantly.
A) increase significantly in size until it bursts
B) decrease significantly in size
C) stay exactly the same size as before
D) One cannot say unless the composition of the gas is known.
Answer: A
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
17) Calculate the volume occupied by 18.0 g of water vapor at 100 °C and 1.00 atm.
A) 11.2 L
B) 22.4 L
C) 30.6 L
D) 61.2 L
Answer: C
Section: Section 11.2
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
18) Assuming that the pressure and quantity of a gas sample remain constant, what will be the final volume of a 4.86 L sample of a gas at 281 °C which is cooled to 225 °C?
A) 5.19 L
B) 4.37 L
C) 2.92 L
D) 2.78 L
Answer: B
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
19) Assuming that the pressure and quantity of a gas sample remain constant, what will be the final volume of a 4.86 L sample of a gas at 281 °C when it is heated to 300 °C?
A) 5.03 L
B) 3.89 L
C) 2.92 L
D) 2.78 L
Answer: A
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
20) 1.86 moles of a gas occupy 245 L at 281 °C under a pressure of 0.346 atm. When the pressure is increased to 0.886 atm while keeping the same temperature, the new volume will be ______.
A) 627 L
B) 799 L
C) 95.7 L
D) 47.8 L
Answer: C
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
21) Assume that the temperature and quantity of a gas sample remain constant. A 1.6 L sample of a gas is originally at 330 K and 4.84 atm. Calculate the final pressure when the volume is reduced to 840 mL.
A) 9.22 atm
B) 4.61 atm
C) 18.44 atm
D) 3.66 atm
Answer: A
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
22) A 4.23 L sample of a gas is originally at 747 mm Hg at 297 K. The volume occupied by the same quantity of gas under the same temperature and 700. torr is ______. 1 atm = 760 torr.
A) 3.96 L
B) 4.51 L
C) 1.88 L
D) 1.68 L
Answer: B
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
23) A gas occupies 340 mL at 273 K and 610 torr. What is the final temperature when the pressure is increased to 1 atm, and the volume being held constant? 1 atm = 760 torr.
A) 67 °C
B) 267 °C
C) 340 °C
D) 613 °C
Answer: A
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
24) Which statement is true for an ideal gas?
A) The pressure of a gas increases when its volume decreases.
B) The pressure of a gas increases when its temperature increases.
C) The pressure of a gas increases when the number of gas moles increases.
D) All of the above statements are correct.
Answer: D
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.
25) A gas sample occupies a volume of 8 L at 20 °C. What is the temperature at which the gas would double its volume?
A) 40 °C
B) 10 °C
C) 273 K
D) 586 K
Answer: D
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
26) 0.024 moles of nitrogen gas occupy 4.0 L at 0.90 atm pressure. What will be the final volume if the container is allowed to expand and the pressure is reduced to 0.30 atm while the temperature is kept constant?
A) 1.33 L
B) 3.6 L
C) 6.0 L
D) 12 L
Answer: D
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
27) If the volume of a given gas sample doubles, what happens to the temperature of the gas? The amount of gas and the pressure of the gas stay the same.
A) increase by a factor of 2
B) decrease by a factor of 2
C) stay exactly the same
Answer: A
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
28) If the pressure of a given gas sample doubles, what happens to the volume of gas? The amount of gas and the temperature of the gas stay the same.
A) increase by a factor of 2
B) decrease by a factor of 2
C) stay exactly the same
Answer: B
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
29) A gas occupies a volume of 480 mL at 127 °C and 140 mm Hg. What mathematical expression will yield the correct volume at 177 °C and 400 mm Hg?
A) 480 × (140/400) × (450/400)
B) 480 × (400/140) × (450/400)
C) 480 × (140/400) × (400/450)
D) 480 × (400/140) × (400/450)
Answer: A
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
30) A gas occupies a volume of 0.500 L at 125 °C and 0.443 atm. What mathematical expression will yield the correct temperature at 0.750 L and 0.689 atm?
A) (0.689 × 0.750 × 125)/(0.443 × 0.500)
B) (0.443 × 0.500 × 398)/(0.689 × 0.750)
C) (0.443 × 0.500)/(0.689 × 0.750 × 398)
D) (0.689 × 0.750 × 398)/(0.443 × 0.500)
Answer: D
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: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
31) STP conditions stand for ______.
A) 0 K, 1 atm
B) 0 °C, 760 cm Hg
C) 0 °C, 760 mm Hg
D) 0 K, 76 cm Hg
Answer: C
Section: Section 11.3
Global Obj: G1 Demonstrate an understanding of the principles of scientific inquiry.
32) A gas occupies 2.00 L at 298 K and 2.10 atm. The volume of this gas at STP is ______.
A) 22.4 L
B) 2.24 L
C) 3.84 L
D) 2.00 L
Answer: C
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.
33) Which of the following gases occupy the largest volume at STP?
A) 12.00 g He
B) 2 mol of water
C) 38.00 g F2
D) 6.022 × 1023 molecules of ammonia
Answer: A
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.
34) The volume of 2.3 g nitrogen gas at STP is ______.
A) 1.8 L
B) 11.2 L
C) 22.4 L
D) 44.8 L
Answer: A
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.
35) Which of the following gases will have the same density at STP?
A) oxygen and methane
B) hydrogen and helium
C) carbon monoxide and nitrogen
D) hydrogen chloride and fluorine
Answer: C
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.
36) Which of the following gases occupy the smallest volume at STP?
A) 4.032 g H2
B) 1.000 mol of carbon dioxide
C) 35.45 g Cl2
D) 6.022 × 1023 molecules of O2
Answer: C
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.
37) The density of carbon dioxide as STP is ______.
A) 0.46 g/ L
B) 1.97 g/ L
C) 3.94 g/ L
D) 5.62 g/ L
Answer: B
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.
38) What weight of nitrogen gas will occupy a volume of 1.25 L at a pressure of 1.0 atm and a temperature of 200.°C?
A) 0.45 g
B) 0.90 g
C) 1.80 g
D) 3.60 g
Answer: B
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.
39) The volume occupied by 4.00 g oxygen gas at STP is ______.
A) 22.4 L
B) 11.2 L
C) 5.60 L
D) 2.80 L
Answer: D
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.
40) 0.249 g of a diatomic element occupies a volume of 125. mL at 120. °C and 2.00 atm. This element is ______.
A) nitrogen
B) oxygen
C) chlorine
D) bromine
Answer: B
Section: Section 11.3
Learning Outcome: 11.4 Calculate the Molar Mass of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
41) An unknown gaseous substance has a density of 1.06 g/L at 31 °C and 371 torr. Its molecular weight is ______.
A) 27 g/mol
B) 54 g/mol
C) 81 g/mol
D) 108 g/mol
Answer: B
Section: Section 11.3
Learning Outcome: 11.4 Calculate the Molar Mass of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
42) An unknown gaseous substance has a density of 1.06 g/L at 31 °C and 371 torr. If the substance has the following percent composition: 88.8% C and 11.2% H, its molecular formula is ______.
A) CH3
B) C2H3
C) C4H6
D) C2H5
Answer: C
Section: Section 11.3
Learning Outcome: 11.4 Calculate the Molar Mass of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
43) The density of hydrogen gas at STP is ______the density of oxygen under identical conditions.
A) four times larger than
B) eight times larger than
C) sixteen times smaller than
D) equal to, since both densities are taken under the same conditions
Answer: C
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.
44) 0.123 g of a gas occupy a volume of 124 mL at 120. °C and 760. torr. Its molar mass is ______g/mol.
A) 22.4
B) 28.1
C) 71.1
D) 32.0
Answer: D
Section: Section 11.3
Learning Outcome: 11.4 Calculate the Molar Mass of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
45) 0.123 g of a gas occupy a volume of 124 mL at 120. °C and 760. torr. The possible formula of the gas is ______.
A) CH4
B) CO2
C) Cl2
D) O2
Answer: D
Section: Section 11.3
Learning Outcome: 11.4 Calculate the Molar Mass of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
46) The molar volume of an ideal gas is ______.
A) always equal to 22.4 L at room temperature
B) proportional to the molecular weight of the gas
C) always equal to 22.4 L at STP
D) inversely proportional to the molecular weight of the gas
Answer: C
Section: Section 11.3
Learning Outcome: 11.3 Perform calculations using the Ideal Gas Law.
Global Obj: G1 Demonstrate an understanding of the principles of scientific inquiry.
47) Which gas has a density equal to 1.43 g/L at STP?
A) nitrogen
B) oxygen
C) helium
D) carbon monoxide
Answer: B
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.
48) The density of carbon tetrachloride at 0.94 atm and 398 K is ______.
A) 1.11 g/L
B) 2.21 g/L
C) 4.43 g/L
D) 8.86 g/L
Answer: C
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.
49) The density of sulfur vapor at 1273 K and 740 mm Hg is 0.5977 g/L. Its molar mass is ______.
A) 32
B) 64
C) 96
D) 128
Answer: B
Section: Section 11.3
Learning Outcome: 11.4 Calculate the Molar Mass of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
50) The density of sulfur vapor at 1273 K and 740 mm Hg is 0.5977 g/L. Sulfur at that temperature will be ______.
A) monoatomic
B) diatomic
C) triatomic
D) tetraatomic
Answer: B
Section: Section 11.3
Learning Outcome: 11.4 Calculate the Molar Mass of a gas using the Ideal Gas Law.
Global Obj: G4 Demonstrate the quantitative skills needed to succeed in chemistry.
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
Answer: A
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.
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
Answer: C
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.
53) Which statement is not true about an ideal gas?