Name:    Online Study Guide - Gas Laws - Chem 1

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

1.

What does the constant bombardment of gas molecules against the inside walls of a container produce?
 a. temperature c. pressure b. density d. diffusion

2.

Standard temperature is exactly
 a. 100ºC. c. 0ºC. b. 273ºC. d. 0 K.

3.

Standard pressure is exactly
 a. 1 atm. c. 101.325 atm. b. 760 atm. d. 101 atm.

4.

The volume of a gas is 400.0 mL when the pressure is 1.00 atm. At the same temperature, what is the pressure at which the volume of the gas is 2.0 L?
 a. 0.5 atm c. 0.20 atm b. 5.0 atm d. 800 atm

5.

A sample of oxygen occupies 560. mL when the pressure is 800.00 mm Hg. At constant temperature, what volume does the gas occupy when the pressure decreases to 700.0 mm Hg?
 a. 80.0 mL c. 600. mL b. 490. mL d. 640. mL

6.

The volume of a gas is 5.0 L when the temperature is 5.0ºC. If the temperature is increased to 10.0ºC without changing the pressure, what is the new volume?
 a. 2.5 L c. 5.1 L b. 4.8 L d. 10.0 L

7.

At 7.0ºC, the volume of a gas is 49 mL. At the same pressure, its volume is 74 mL at what temperature?
 a. 3.0ºC c. 120ºC b. 423ºC d. 150ºC

8.

The volume of a gas is 93 mL when the temperature is 91ºC. If the temperature is reduced to 0ºC without changing the pressure, what is the new volume of the gas?
 a. 70. mL c. 120 mL b. 93 mL d. 273 mL

9.

On a cold winter morning when the temperature is –13ºC, the air pressure in an automobile tire is 1.5 atm. If the volume does not change, what is the pressure after the tire has warmed to 15ºC?
 a. –1.5 atm c. 3.0 atm b. 1.7 atm d. 19.5 atm

10.

The pressure of a sample of gas at 10.0ºC increases from 700. mm Hg to 900. mm Hg. What is the new temperature?
 a. 0ºC c. 39.0ºC b. 364ºC d. 90.9ºC

11.

The volume of a sample of oxygen is 300.0 mL when the pressure is 1.00 atm and the temperature is 27.0ºC. At what temperature is the volume 1.00 L and the pressure 0.500 atm?
 a. 22.0ºC c. 0.50 K b. 45.0ºC d. 227ºC

12.

The volume of a gas collected when the temperature is 11.0ºC and the pressure is 710 mm Hg measures 14.8 mL. What is the calculated volume of the gas at 20.0ºC and 740 mm Hg?
 a. 7.8 mL c. 14.6 mL b. 13.7 mL d. 15 mL

13.

In the reaction represented by the equation N2(g) + 2O2(g) 2NO2(g), what is the volume ratio of N2 to NO2?
 a. 1:1 c. 2:1 b. 1:2 d. 2:5

14.

The equation for the production of methane is C + 2H2(g) CH4(g). How many liters of hydrogen are needed to produce 20. L of methane?
 a. 2.0 L c. 22.4 L b. 20. L d. 40. L

15.

What is the number of moles of H2 produced when 23 g of sodium react with water according to the equation 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)?
 a. 0.50 mol c. 2.0 mol b. 1.0 mol d. 4.0 mol

16.

The principle that under similar pressures and temperatures, equal volumes of gases contain the same number of molecules is attributed to
 a. Boyle. c. Avogadro. b. Graham. d. Dalton.

17.

The standard molar volume of a gas at STP is
 a. 22.4 L. c. g-mol wt/22.4 L. b. g/22.4 L. d. 1 L.

18.

A 1.00 L sample of a gas has a mass of 1.92 g at STP. What is the molar mass of the gas?
 a. 1.92 g/mol c. 22.4 g/mol b. 19.2 g/mol d. 43.0 g/mol

19.

A 1.00 L sample of a gas has a mass of 1.25 g at STP. What is the mass of 1.00 mol of this gas?
 a. 0.855 g c. 22.4 g b. 1.25 g d. 28.0 g

20.

What is the value of the gas constant?
 a. c. b. d.

21.

Calculate the approximate volume of a 0.600 mol sample of gas at 15.0°C and a pressure of 1.10 atm.
 a. 12.9 L c. 24.6 L b. 22.4 L d. 139 L

22.

Calculate the approximate temperature of a 0.50 mol sample of gas at 750 mm Hg and a volume of 12 L.
 a. –7ºC c. 15ºC b. 11ºC d. 288ºC

23.

What is the pressure exerted by 1.2 mol of a gas with a temperature of 20.ºC and a volume of 9.5 L?
 a. 0.030 atm c. 3.0 atm b. 1.0 atm d. 30. atm

24.

A sample of gas at 25ºC has a volume of 11 L and exerts a pressure of 660 mm Hg. How many moles of gas are in the sample?
 a. 0.39 mol c. 9.3 mol b. 3.9 mol d. 87 mol

25.

A gas sample with a mass of 12.8 g exerts a pressure of 1.2 atm at 15ºC and a volume of 3.94 L. What is the molar mass of the gas?
 a. 19 g/mol c. 64 g/mol b. 32 g/mol d. 128 g/mol

26.

A gas is confined in a steel tank with a volume of 6.982 L. At 20.20°C, the gas exerts a pressure of 8.532 atm. After heating the tank, the pressure of the gas increases to 10.406 atm. What is the temperature of the heated gas?
 a. –32.60°C c. 84.59°C b. 24.63°C d. 92.64°C

27.

How many moles of helium gas are contained in a 4.0-L flask at STP?
 a. 0.045 mol c. 0.17 mol b. 0.089 mol d. 89 mol

28.

A steel tank with a volume of 9.583 L contains N2 gas under a pressure of 4.972 atm at 31.8 °C. Calculate the number of moles of N2 in the tank.
 a. 0.002 mol c. 0.525 mol b. 0.018 mol d. 1.90 mol

29.

According to Gay-Lussac’s law:
 a. pressure is inversely proportional to volume at constant temperature. b. pressure is directly proportional to temperature at constant volume. c. volume is inversely proportional to temperature at constant pressure. d. volume is directly proportional to temperature at constant pressure.

30.

What volume of oxygen is needed to react with solid sulfur to form 6.20 L of sulfur dioxide?
 a. 6.20 L c. 12.4 L b. 7.20 L d. 99.2 L

31.

How many moles of steam are produced at 2.00 atm and 202.0°C by the complete combustion of 12.50 L of methane gas?
 a. 0.001 mol c. 0.640 mol b. 0.012 mol d. 1.28 mol

32.

When a milkshake is taken in through a straw at a pressure of 0.071 atm, the straw contains 5.0 mL of liquid. How much liquid is consumed at 0.092 atm?
 a. 0.10 mL c. 6.3 mL b. 3.9 mL d. 7.8 mL

33.

In a hospital, oxygen is administered to patients at 3.0 atm in a hyperbaric oxygen chamber. Oxygen gas, measuring 600.0 L, is compressed in a cylinder at 160.0 atm. What volume of oxygen can a cylinder supply at the given pressure?
 a. 11 L c. 11 ´ 103 L b. 32 L d. 32 ´ 103 L

34.

A 2.50 L balloon is filled with water at 2.27 atm. If the balloon is squeezed into a 0.80 L beaker and does NOT burst, what is the pressure of water in the balloon?
 a. 0.72 atm c. 7.1 atm b. 0.88 atm d. 8.8 atm

35.

A balloon is filled with 3.50 L of water at 24.0°C and 2.27 atm. If the balloon is placed outdoors on a hot day at a temperature of 34.0°C, what is the volume of the balloon at constant pressure?
 a. 2.47 L c. 3.61 L b. 3.38 L d. 8.19 L

36.

The volume of a sample of helium is 4.50 mL at 20.0°C and 203.0 kPa. What will its volume be at 10.0°C and 203.0 kPa?
 a. 2.25 mL c. 4.34 mL b. 3.78 mL d. 6.85 mL

37.

The volume of a 24.0-g sample of methane gas is 22.8 L at 40.0°C and 4.00 atm. What will its volume be at 68.0°C and 4.00 atm?
 a. 20.9 L c. 38.7 L b. 24.8 L d. 40.8 L

38.

A 40.0-L sample of fluorine is heated from 90.0°C to 186.0°C. What volume will the sample occupy at the higher temperature?
 a. 19.3 L c. 50.5 L b. 31.6 L d. 82.6 L

39.

A welding torch requires 3200 L of ethylene gas at 3.00 atm. What will be the pressure of the gas if ethylene is supplied by a 250.0-L tank?
 a. 0.231 atm c. 38.4 atm b. 2.34 atm d. 45.4 atm

40.

The volume of a gas is 1.50 L at 30.0°C and 1.00 atm. What volume will the gas occupy if the temperature is raised to 134.0°C at constant pressure?
 a. 0.331 L c. 2.01 L b. 1.11 L d. 6.70 L

41.

A sample of carbon dioxide occupies a 2.54 dm3 container at STP. What is the volume of the gas at a pressure of 150.0 kPa and a temperature of 26.0°C?
 a. 0.180 dm3 c. 2.24 dm3 b. 1.88 dm3 d. 4.65 dm3

42.

One liter of a gas has a pressure of 150.00 kPa at 25.0°C. If the pressure increases to 600.0 kPa and the temperature to 100.0°C, what would be the new volume of the gas?
 a. 0.200 L c. 1.00 L b. 0.312 L d. 2.90 L

Matching

Match the terms below with their correct definitions.
 a. Avogadro’s principle e. Gay-Lussac’s law b. Boyle’s law f. ideal gas constant c. Charles’s law g. ideal gas law d. combined gas law h. molar volume

43.

Equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

44.

One mole of any gas will occupy a volume of 22.4 L at STP.

45.

R represents the relationship among pressure, volume, temperature, and number of moles of gas present.

46.

Temperature, pressure, and volume are related for a fixed amount of gas.

47.

The physical behavior of an ideal gas can be expressed in terms of the pressure, volume, temperature, and number of moles of gas present.

48.

The pressure of a given mass of gas varies directly with the kelvin temperature when the volume remains constant.

49.

The volume of a given amount of gas held at a constant temperature varies inversely with the pressure.

50.

The volume of a given mass of gas is directly proportional to its kelvin temperature at constant pressure.