SAT II PRACTICE PROBLEMS ON GAS LAWS
1. The molecular weight of a gas is 16. At STP, 4.48 liters of this gas has a mass of:
a) 2.3 g b) 2.7 g c) 3.2 g d) 4.1 g e) 4.9 g
2. What volume of water is required to produce 5 liters of oxygen at STP by the following process?
H2O(g)  H2(g) + O2(g)
a) 3 L b) 5 L c) 10 L d) 14 L e) 16 L
3. What volume does a sample of 1.50 x 1023 atoms of He at STP represent?
a) 5.6 L b) 11.2 L c) 17.8 d) 22.4 L e) none of these
Question 4-7 below:
a) temperature(s) b) universal gas constant c) volume(s) d) pressure(s) e) molecular weight
4. At a constant number of moles and pressure, the volume of an ideal gas is directly proportional to
its…
5. The kinetic energy of a sample of an ideal gas is a property only of…
6. The rate of effusion of two gasses is inversely proportional to the squre root of their…
7. At constant temperature, the volume of a given amount of an ideal gas is inversely proportional to
its…
8. Decreasing the volume of a closed system decreases the pressure because pressure and volume are
inversely related. True or False?
9. Twenty liters of NO gas react with excess oxygen. How many liters of NO2 gas are produced if
the NO gas reacts completely at STP?
a) 5 L b) 10 L c) 20 L d) 40 L e) 50 L
10. What is the density of a diatomic gas whose gram-molecular weight is 80 g at STP?
a) 1.9 g/L b) 2.8 g/L c) 3.6 g/L d) 4.3 g/L e) 5.0 g/L
11. Gases that are prepared through chemical reaction and bubbled up through a water trough into a
collection tube are that that are:
a) water soluble b) water insoluble c) heavier than air d) lighter than air e) none of these
12. The rate of diffusion of hydrogen gas as compared to that of oxygen gas is:
a) ½ as fast b) identical c) twice as fast d) four times as fast e) eight times as fast
Questions below 13-16:
a) PV=K at constant n and T
d) V=kT at constant n and P
b) Pr = PA+PB + PC
e) V = kn at constant P and T
13. The combined gas law.
14. Boyle’s Law
15. Charles and Gay-Lussac’s Law
16. Avogadro’s Law
c) PV = nRT
17. One or more of the responses given for the following question is correct. Choose the correct
response. Then choose:
a) if 1, 2 and 3 are correct
b) if only 1 and 2 are correct
c) if only 2 and 3 are correct
d) if only 1 is correct
e) if only 3 is correct
18. Which of the following will cause the pressure of a gas to increase?
1) Decreasing the volume while maintaining the temperature.
2) Decreasing the volume while increasing the temperature
3) Increasing the volume by 1 liter while increasing the temperature by 1K at STP
Questions 18-20:
a) Gas at room temperature and pressure
b) Liquid at room temperature and pressure
c) solid at room temperature and pressure
d) does not ordinarily exist at room temperature and pressure
e) at equilibrium between two phases at room temperature and pressure
19. Hg
20. CH4
21. Cl2
22. The relation P1V1 = P2V2 is known as:
a) Boyle’s Law
b) Charles’s Law
d) the combined gas law
e) the ideal gas law
c) van der Waal’s Law
23. The ratio of the rates of diffusion of oxygen to hydrogen is:
a) 1:2 b) 1:4 c) 1:8 d) 1:16 e) 1:32
24. Standard conditions using a Kelvin thermometer are:
a) 760 torr, 273 K b) 760 torr, 273 K and 1 L c) 0 torr, 0 K e) 0 torr, 273 K, 1 L
25. What is the resulting volume if 10 liters of a gas at 546 K and 2 atm is brought to standard
conditions?
a) 5 L b) 10 L c) 15 L d) 20 L e) 25 L
26. The Fahrenheit temperature corresponding to 303 K is:
a) -15C b) 22C c) 49C d) 86C e) 1069C
27. What is the density of bromine vapor at STP?
a) 2.5 g/L b) 2.9 g/L c) 3.6 g/L d) 4.9 g/L e) 7.1 g/L
28. The relation between pressure and volume of a gas at constant temperature is given by:
a) Boyle’s Law
b) Charles’s Law c) the combined gas law
d) the ideal gas law
e) none of these
29. The relation between the pressure, volume and absolute temperature is given by:
a) Boyle’s Law b) Charles’s Law c) the combined gas law d) the ideal gas law e) none of these
The questions below consist of two statements:
Determine if Statement I is true or false. Determine if Statement II is true or false. Then determine if
the second statement is a correct explanation of the first statement.
30. Statement I: At a particular temperature it is easier to compress a gas than a liquid
Because
31. Statement II: in a gas the distances between molecules are greater than in a liquid
32. Statement II is a correct explanation of Statement I. True of False?
33. Statement III: At constant pressure, a certain amount of gas will double in volume as the
temperature is halved
Because
33. Statement IV: this would mean that the atmosphere was entirely composed of that substance in
its gaseous state.
34. Statement IV is a correct explanation of Statement III. True or False?
35. Statement V: At high altitudes water takes less time to boil. True or False?
because
36. Statement VI: of the lower atmospheric pressure at high altitudes.
37. Statement VI is a correct explanation of Statement V. True or False?
38. A substance will boil at a lower temperature if:
a) the volume of the system is decreased
b) the pressure of the system is decreased
c) an additional amount of the substance is added.
39. What volume would 16 g of oxygen gas occupy at STP?
a) 5.6 L b) 11.2 L c) 22.4 L d) 33.6 L e) 44.8 L
40. What volume does 8.5 g of ammonia occupy at STP?
a) 2.8 L b) 5.6 L c) 11.2 L d) 22.4L e) 44.8 l
Which of these plots would be obtained if one were to experimentally investigate:
a)
41. Boyle’s Law
42. Charles’s Law
43. The relationship of P and T
b)
c)
d)
e)