Gas/Mole Test Review

1. _________

As the temperature of a gas increases at constant pressure, the volume of the gas
A. decreases
B. increases
C. remains the same
2. _________

Which diagram best represents a gas in a closed container?

A.

C.

B.

D.

3. _________

The table below shows data for the temperature, pressure, and volume of four gas samples.

Which two gas samples have the same total number of molecules?
A. A and B
B. A and C
C. B and C
D. B and D

4. _________

A sample of oxygen gas is sealed in container X. A sample of hydrogen gas is sealed in container Z. Both
samples have the same volume, temperature, and pressure. Which statement is true?
A. Container X contains more gas molecules than container Z.
B. Container X contains fewer gas molecules than container Z.
C. Containers X and Z both contain the same number of gas molecules.
D. Containers X and Z both contain the same mass of gas.
5. _________

The temperature of 100 milliliters of a gas at 200.K is increased to 400.K, pressure remaining constant. The new
volume of the gas will be
A. 50.0 ml
B. 100. ml
C. 200. ml
D. 400. ml
6. _________

Which graph shows the pressure-temperature relationship expected for an ideal gas?

A.

C.

B.

D.

7. _________

The diagram shows two flasks connected by a stop cock. Flask A contains helium gas. Flask B contains a
vacuum. What final volume will the gas occupy after the stopcock is open?
A. 100ml
B. 300ml
C. 400ml

D. 500ml
8. _________

A sealed flask containing 1.0 mole of H2(g) and a sealed flask containing 2.0 moles of He(g) are at the same
temperature. The two gases must have equal
A. masses
B. volumes
C. average kinetic energies
D. numbers of molecules
9. _________

The volume of a gas is 4.00 liters at 293 K and constant pressure. For the volume of the gas to become 3.00
liters, the Kelvin temperature must be equal to
A.
B.

C.

D.
10.

Base your answer to the question on the information below.

Air bags are an important safety feature in modern automobiles. An air bag is inflated in milliseconds by the
explosive decomposition of NaN3(s). The decomposition reaction produces N2(g), as well as Na(s), according to
the unbalanced equation below.
NaN3(s) Na(s) + N2(g)
When the air bag inflates, the nitrogen gas is at a pressure of 1.30 atmospheres, a temperature of 301 K, and has
a volume of 40.0 liters. Calculate the volume of the nitrogen gas at STP.
Answer:

11. _________

A sample of gas occupies a volume of 50.0 milliliters in a cylinder with a movable piston. The pressure of the
sample is 0.90 atmosphere and the temperature is 298 K. What is the volume of the sample at STP?
A. 41 mL
B. 49 mL
C. 51 mL
D. 55 mL
12.

Base your answer to this question on the information below.

A piece of magnesium ribbon is reacted with excess hydrochloric acid to produce aqueous magnesium chloride
and hydrogen gas. The volume of the dry hydrogen gas produced is 45.6 milliliters. The temperature of the gas
is 293 K, and the pressure is 99.5 kilopascals.
Calculate the volume this dry hydrogen gas would occupy at STP.
Answer:

mL

13. _________

Which temperature change would cause the volume of a sample of an ideal gas to double when the pressure of
the sample remains the same?
A. from 200C to 400C
B. from 400C to 200C
C. from 200 K to 400 K
D. from 400 K to 200 K
14. _________

Which element is a solid at STP?

A. H2
B. I2
C. N2
D. O2
15. _________

What is the gram formula mass of Ca3(PO4)2?

A. 135 g/mol
B. 215 g/mol
C. 278 g/mol
D. 310. g/mol
16. _________

How many moles of N2(g) would contain exactly 4.0 moles of nitrogen atoms?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
17. _________

Equal volumes of SO2(g) and O2(g) at STP contain the same number of
A. atoms
B. molecules
C. electrons

D. protons
18. _________

A 1-gram sample of which substance in a sealed 1-liter container will occupy the container completely and
uniformly?
A. Ag(s)
B. Hg(l)
C. H2O(l)
D. H2O(g)
19.

Two alcohols that are used in our everyday lives are rubbing alcohol and ethylene glycol. Rubbing alcohol is
used as an antiseptic. Ethylene glycol is the main ingredient in antifreeze, which is used in automobile cooling
systems.
What is the gram-formula mass of ethylene glycol, C2H4(OH)2?
g/mol
20. _________

As the temperature of a given sample of a gas decreases at constant pressure, the volume of the gas
A. decreases
B. increases
C. remains the same
21. _________

The concept of an ideal gas is used to explain

A. the mass of a gas sample
B. the behavior of a gas sample
C. why some gases are monatomic
D. why some gases are diatomic
22.

What is the mass of 4.76 moles of Na3PO4 (gram-formula mass = 164 grams/mole)?
Answer:

23. _________

At constant pressure, what temperature must be reached to increase a 100-milliliter sample of a gas initially at
300K to a volume of 200 milliliters?
A. 150K
B. 200K
C. 300K
D. 600K

24. _________

Which is a characteristic of all mixtures?

A. They are homogeneous.
B. They are heterogeneous.
C. Their composition is a definite ratio.
D. Their composition can be varied.
25. _________

If the components of a liquid hydrocarbon are to be separated by fractional distillation, the components should
have
A. large differences between their boiling points
B. very small differences between their boiling points
C. large differences between their freezing points
D. very small differences between their freezing points
26. _________

Recovering the salt from a mixture of salt and water could best be accomplished by
A. evaporation
B. filtration
C. paper chromatography
D. density determination
27. _________

A bottle of rubbing alcohol contains both 2-propanol and water. These liquids can be separated by the process of
distillation because the 2-propanol and water
A. have combined chemically and retain their different boiling points
B. have combined chemically and have the same boiling point
C. have combined physically and retain their different boiling points
D. have combined physically and have the same boiling point
28. _________

Under which conditions are gases most soluble in water?

A. high pressure and high temperature
B. high pressure and low temperature
C. low pressure and high temperature
D. low pressure and low temperature
29. _________

The behavior of real gases most closely resembles that of ideal gases under conditions of
A. high temperature and low pressure
B. high temperature and high pressure

C. low temperature and low pressure

D. low temperature and high pressure
30. _________

One reason that a real gas deviates from an ideal gas is that molecules of the real gas have
A. a straight line motion
B. no net loss of energy on collision
C. a negligible volume
D. forces of attraction for each other
31. _________

An ideal gas is made up of gas particles that

A. have volume
B. can be liquified
C. attract each other
D. are in random motion
32. _________

If the pressure and Kelvin temperature of 2.00 moles of an ideal gas at STP are doubled, the resulting volume
will be
A. 5.60 L
B. 11.2 L
C. 22.4 L
D. 44.8 L
33. _________

What is the total mass of oxygen in 1.00 mole of Al2(CrO4)3?

A. 192 g
B. 112 g
C. 64.0 g
D. 48.0 g
34. _________

What is the gram formula mass of Li2SO4?

A. 54g
B. 55g
C. 110g
D. 206g
35. _________

What is the gram formula mass of (NH4)2SO4?

A. 66.0 g
B. 94.0 g
C. 114 g
D. 132 g
36. _________

What is the total mass in grams of 0.75 mole of SO2?

A. 16 g
B. 24 g
C. 32 g
D. 48 g
37. _________

One mole of which substance contains a total of 6.02 1023 atoms?

Li
A.
NH3
B.
C.

O2

D.

CO2

38. _________

What is the gram formula mass of (NH4)3PO4?

A. 113 g
B. 121 g
C. 149 g
D. 404 g
39. _________

Which 5.0-milliliter sample of NH3 will take the shape of and completely fill a closed
100.0-milliliter container?
A. NH3(s)
B. NH3(l)
C. NH3(g)
D. NH3(aq)
40. _________

Two basic properties of the gas phase are

A. a definite shape and a definite volume
B. a definite shape but no definite volume
C. no definite shape but a definite volume
D. no definite shape and no definite volume

41. _________

A 3.00-liter sample of gas is at 288 K and 1.00 atm. If the pressure of the gas is increased to 2.00 atm and its
volume is decreased to 1.50 liters, the Kelvin temperature of the sample will be
A. 144 K
B. 288 K
C. 432 K
D. 576 K
42. _________

The pressure on a 200-milliliter sample of CO2(g) at constant temperature is increased from 600 kilopascal to
1,200 kilopascal. What is the new volume of the gas?
A. 100 mL
B. 300 mL
C. 400 mL
D. 600 mL
43. _________

The graph represents the heating curve of a substance that starts as a solid below its freezing point. What is the
melting point of this substance?
A. 30C
B. 55C
C. 90C
D. 120C
44. _________

Base your answer to question on the graph below, which represents the cooling of a substance starting at a
temperature above its boiling point.

Which segment of the graph represents the gas phase, only?

A.
B.
C.
D.

Answer Key for: Gas/Mole Test Review

Print Close

1. B
2. A
3. B
4. C
5. C
6. A
7. D
8. C
9. A
10. 47.2
11. A
12. 41.7
13. C
14. B
15. D
16. B
17. B
18. D
19. 62
20. A
21. B
22. 781

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D
D
A
A
C
B
A
D
D
D
A
C
D
D
A
C
C
D
B
A
B
A