Gases Practice Problems - El Camino College

Gases Practice Problems

1) Which description best fits a gas? 1)
A) definite volume and shape; strong intermolecular attractions 2)
B) definite volume, but takes the shape of container; moderate intermolecular attractions 3)
C) takes the volume and shape of container; strong intermolecular attractions 4)
D) takes the volume and shape of container; negligible intermolecular attractions 5)
E) tastes great; less filling 6)
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2) Which of the following is NOT part of the kinetic theory of gases? 8)
A) A gas is mostly empty space - the gass particles occupy a negligibly small volume.

B) Gas particles move rapidly in straight lines.

C) Gas particles move faster when the temperature increases.

D) Gas particle collisions are completely elastic.

E) Gases have no mass.

3) According to the kinetic theory of gases, particles of a gas
A) occupy large volumes.
B) move slowly.
C) show decreased velocity as temperature increases.
D) stick to each other if they collide with one another.
E) are very far apart.

4) A gas can be compressed much more than a liquid or solid because
A) a gas is composed of squishy particles.
B) gas particles can change size.
C) gas particles are easy to push around and intimidate.
D) a gas is mostly empty space.

5) The force of gas particles hitting the walls of a container gives rise to __________.
A) mass
B) sound
C) temperature
D) volume
E) pressure

6) What unit of temperature is always used in gas law calculations?

A) terms like "somewhat hot" or "fairly cold" usually work just fine
B) Any temperature unit - it doesn't matter as long as we're consistent.

C) Celsius or Kelvin but not Farenheit

D) Celsius

E) Kelvin

7) Volume and pressure are ________ proportional. B) inversely
A) directly D) none of the above
C) all of the above

8) Volume and temperature are ________ proportional.

A) directly B) inversely

C) all of the above D) none of the above

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9) Which is not a correct statement of Charles's Law? 9)
10)
A) V1 = V2
T1 T2

B) V1 = slope (a constant)
T1

C) volume is directly proportional to temperature
D) temperature and volume are unrelated properties.
E) temperature and volume are inversely proportional.

10) How will the volume of a sample of gas change if its pressure is doubled? (assume
constant temperature)

11) How will the volume of a sample of gas change if its temperature is doubled? (assume 11)
constant pressure)

12) Sketch a graph illustrating Boyle's Law. Use a gas sample with a volume of 2.0 L at 0.75 12)
atm, and show at least two other points.

13) When the volume of a gas is plotted against temperature, the x-intercept will occur at what 13)
temperature?

A) 0°C
B) 273°C
C) 100°C
D) 5
E) 0 K (-273°C)

14) A tank contains helium gas at 1.50 atm. What is the pressure of the gas in mm Hg? 14)

15) The volume of a gas with a pressure of 1.2 atm increases from 1.0 L to 4.0 L. What is the final 15)
pressure of the gas, assuming constant temperature?

16) The gas with an initial volume of 24.0 L at a pressure of 565 mmHg is compressed until the 16)
volume is 16.0 L. What is the final pressure of the gas, assuming the temperature does not
change?

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17) The temperature of a 500.0 mL sample of gas increases from 150.0 K to 350.0 K. What is the 17)
final volume of the sample of gas, if the pressure in the container is kept constant?

18) A 10.0 liter balloon was taken from a temperature of 25.0°C and placed in a freezer at a 18)
temperature of -15.0°C. What was the new volume if pressure is constant?

19) A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0°C. During the 19)
summer, the temperature in the storage area reached 40.0°C. What was the pressure in the
gas tank then?

20) A sample of argon at 300.°C and 50.0 atm pressure is cooled in the same container to a 20)
temperature of 0°C. What is the new pressure?

21) A 30.0 g sample of argon has a volume of 6.50 L. If an additional 25.0 g of argon is added at 21)
constant temperature and pressure, what will the new volume be?

22) A diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a 22)
temperature of 15 °C. What is the volume of the bubble when it reaches the surface where
the pressure is 1.0 atm and the temperature is 27 °C?

23) At STP, temperature and pressure have the values of 23)
A) 0 K and 760 mm Hg.
B) 760 K and 273 atm.
C) 0 K and 1 atm.
D) 273 K and 1 mm Hg.
E) 273 K and 760 mm Hg.

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24) How many moles of neon occupy a volume of 14.3 L at STP? 24)
25)
25) At STP, what is the volume of 4.50 moles of Xe gas? 26)
26) At STP, what is the volume of 1.0 mol of carbon dioxide? 27)
28)
27) At STP, how many moles of helium would occupy 1.00 L? 29)

28) At STP conditions, 11.0 g of SO2 has a volume of __________.
29) When 25.0 g of zinc reacts, how manyliters of H2 gas are formed at STP?

Zn(s) + 2 HCl(aq) H2(g) + ZnCl2(aq)

30) If 1.26 liters of H2 gas are formed at STP, how many grams of HCl reacted? 30)
Zn(s) + 2 HCl(aq) H2(g) + ZnCl2(aq) 31)

31) How many liters of O2 gas at STP, are needed to react with 15.0 g of Na?
4 Na(s) + O2(g ) 2Na2O(s)

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32) Determine the volume of O2 (at STP) formed when 50.0 g of KClO3 decomposes according 32)
to the following reaction. The molar mass for KClO3 is 122.55 g/mol.

2 KClO3(s) 2 KCl(s) + 3 O2(g)

33) Determine the volume of SO2 (at STP) formed from the reaction of 55.0 L of O2 (at STP). 33)
4 FeS2(s) + 11 O2(g) 2 Fe2O3(s) + 8 SO2(g)

34) Subtracting the vapor pressure of water from the total pressure of a gas collected over water is an 34)
example of the application of:
A) ideal gas law
B) van der Waals Theory
C) Graham's Law
D) Avogadro's Hypothesis
E) Dalton's Law

35) A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of 35)
cyclopropane in the mixture is 330 mm Hg and the partial pressure of the oxygen is 1.0 atm,
what is the total pressure of the mixture in torr?

36) A gas sample contains 4.0 g of CH4 and 2.0 g of He. What is the volume of the sample at 36)
STP?

37) A gas sample containing 12.0 g of CH4 has a volume of 14.0 L. What will the volume be if 37)
12.0 g of He is added? (Temperature and pressure do not change.)

TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 38)
38) We occasionally use Celsius temperature in gas law calculations. 39)
39) The volume of 1 mole of any gas at STP is 22.4 L. 40)
40) The air we breathe is about 21% oxygen. 41)
41) The pressure exerted by a gas on its container is inversely related to its Kelvin temperature.

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