Gas/Mole Test Review
1.______
As the temperature of a gas increases at constant pressure, the volume of the gas
  1. decreases
  2. increases
  3. remains the same

2.______
Which diagram best represents a gas in a closed container?
/
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?
  1. A and B
  2. A and C
  3. B and C
  4. 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?
  1. Container X contains more gas molecules than container Z.
  2. Container X contains fewer gas molecules than container Z.
  3. Containers X and Z both contain the same number of gas molecules.
  4. 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
  1. 50.0 ml
  2. 100. ml
  3. 200. ml
  4. 400. ml

6.______
Which graph shows the pressure-temperature relationship expected for an ideal gas?
/
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?
  1. 100ml
  2. 300ml
  3. 400ml
  4. 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
  1. masses
  2. volumes
  3. average kinetic energies
  4. 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

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: L
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?
  1. 41 mL
  2. 49 mL
  3. 51 mL
  4. 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?
  1. from 200°C to 400°C
  2. from 400°C to 200°C
  3. from 200 K to 400 K
  4. from 400 K to 200 K

14.______
Which element is a solid at STP?
  1. H2
  2. I2
  3. N2
  4. O2

15.______
What is the gram formula mass of Ca3(PO4)2?
  1. 135 g/mol
  2. 215 g/mol
  3. 278 g/mol
  4. 310. g/mol

16.______
How many moles of N2(g) would contain exactly 4.0 moles of nitrogen atoms?
  1. 1.0
  2. 2.0
  3. 3.0
  4. 4.0

17.______
Equal volumes of SO2(g) and O2(g) at STP contain the same number of
  1. atoms
  2. molecules
  3. electrons
  4. protons

18.______
A 1-gram sample of which substance in a sealed 1-liter container will occupy the container completely and uniformly?
  1. Ag(s)
  2. Hg(l)
  3. H2O(l)
  4. 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
  1. decreases
  2. increases
  3. remains the same

21.______
The concept of an ideal gas is used to explain
  1. the mass of a gas sample
  2. the behavior of a gas sample
  3. why some gases are monatomic
  4. why some gases are diatomic

22.
What is the mass of 4.76 moles of Na3PO4 (gram-formula mass = 164 grams/mole)?
Answer: g
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?
  1. 150K
  2. 200K
  3. 300K
  4. 600K

24.______
Which is a characteristic of all mixtures?
  1. They are homogeneous.
  2. They are heterogeneous.
  3. Their composition is a definite ratio.
  4. Their composition can be varied.

25.______
If the components of a liquid hydrocarbon are to be separated by fractional distillation, the components should have
  1. large differences between their boiling points
  2. very small differences between their boiling points
  3. large differences between their freezing points
  4. very small differences between their freezing points

26.______
Recovering the salt from a mixture of salt and water could best be accomplished by
  1. evaporation
  2. filtration
  3. paper chromatography
  4. 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
  1. have combined chemically and retain their different boiling points
  2. have combined chemically and have the same boiling point
  3. have combined physically and retain their different boiling points
  4. have combined physically and have the same boiling point

28.______
Under which conditions are gases most soluble in water?
  1. high pressure and high temperature
  2. high pressure and low temperature
  3. low pressure and high temperature
  4. low pressure and low temperature

29.______
The behavior of real gases most closely resembles that of ideal gases under conditions of
  1. high temperature and low pressure
  2. high temperature and high pressure
  3. low temperature and low pressure
  4. 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
  1. a straight line motion
  2. no net loss of energy on collision
  3. a negligible volume
  4. forces of attraction for each other

31.______
An ideal gas is made up of gas particles that
  1. have volume
  2. can be liquified
  3. attract each other
  4. 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
  1. 5.60 L
  2. 11.2 L
  3. 22.4 L
  4. 44.8 L

33.______
What is the total mass of oxygen in 1.00 mole of Al2(CrO4)3?
  1. 192 g
  2. 112 g
  3. 64.0 g
  4. 48.0 g

34.______
What is the gram formula mass of Li2SO4?
  1. 54g
  2. 55g
  3. 110g
  4. 206g

35.______
What is the gram formula mass of (NH4)2SO4?
  1. 66.0 g
  2. 94.0 g
  3. 114 g
  4. 132 g

36.______
What is the total mass in grams of 0.75 mole of SO2?
  1. 16 g
  2. 24 g
  3. 32 g
  4. 48 g

37.______
One mole of which substance contains a total of 6.02 × 1023 atoms?
  1. Li
  2. NH3
  3. O2
  4. CO2

38.______
What is the gram formula mass of (NH4)3PO4?
  1. 113 g
  2. 121 g
  3. 149 g
  4. 404 g

39.______
Which 5.0-milliliter sample of NH3 will take the shape of and completely fill a closed
100.0-milliliter container?
  1. NH3(s)
  2. NH3(l)
  3. NH3(g)
  4. NH3(aq)

40.______
Two basic properties of the gas phase are
  1. a definite shape and a definite volume
  2. a definite shape but no definite volume
  3. no definite shape but a definite volume
  4. 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
  1. 144 K
  2. 288 K
  3. 432 K
  4. 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?
  1. 100 mL
  2. 300 mL
  3. 400 mL
  4. 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?
  1. 30°C
  2. 55°C
  3. 90°C
  4. 120°C

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?

Answer Key for: Gas/Mole Test Review

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1. B / 23. D
2. A / 24. D
3. B / 25. A
4. C / 26. A
5. C / 27. C
6. A / 28. B
7. D / 29. A
8. C / 30. D
9. A / 31. D
10. 47.2 / 32. D
11. A / 33. A
12. 41.7 / 34. C
13. C / 35. D
14. B / 36. D
15. D / 37. A
16. B / 38. C
17. B / 39. C
18. D / 40. D
19. 62 / 41. B
20. A / 42. A
21. B / 43. B
22. 781 / 44. A