1.
calculate the approximate volume of a 0.500 mol sample of gas at 15°c and a pressure of 1.10 atm.

9.40 l

22.4 l

10.7 l

0.560 l

2.
a sample of oxygen occupies 280 ml when the pressure is 840 mm hg. at constant temperature, what volume does the gas occupy when the pressure increases to 950 mm hg?

317 ml

190 ml

390 ml

248 ml

3.
if the temperature of a fixed quantity of a gas decreases and the pressure remains unchanged, which of the following will happen?

the volume of the gas will decrease.

the volume of the gas will remain unchanged.

the density of the gas will decrease.

the volume of the gas will increase.

4.
calculate the approximate temperature of a 0.40 mol sample of gas at 750 mm hg and a volume of 11 l.

–17°c

57.5°c

60.5°c

331°c

5.
the volume of a gas is 2.0 l when the temperature is 2.0°c. if the temperature is increased to 10.0°c without changing the pressure, what is the new volume?

10.0 l

0.40 l

1.94 l

2.06 l

6.
at constant temperature and pressure, gas volume is directly proportional to which of the following?

density of the gas at standard temperature and pressure

rate of diffusion

number of moles of gas

molar mass of the gas

7.
the expression v = kn is a statement of which law?

avogadro’s law

the law of combining volumes

graham’s law of effusion

boyle’s law

8.
calculate the approximate volume of a 0.200 mol sample of gas at 15°c and a pressure of 1.10 atm.

22.4 l

0.224 l

4.30 l

3.76 l

9.
all of the following gas laws are direct proportions except which of the following laws?

boyle’s law

avogadro’s law

gay-lussac’s law

charles’s law

10.
if vo is the original volume, vnew is the new volume, to is the original kelvin temperature, and tnew is the new kelvin temperature, how is charles’s law expressed mathematically?

11.
the gas pressure inside a container decreases when which of the following happens?

the number of molecules is increased and the temperature is increased

the number of gas molecules is decreased

the temperature is increased

the number of gas molecules is increased

12.
if a sample of helium gas at 860 torr and 21°c is allowed to expand from 2.2 l to 5.4 l without changing the temperature, what pressure will the helium gas exert?

962 torr

275 torr

2.01 x 103 torr

350 torr

13.
a sample of oxygen occupies 550 ml when the pressure is 790 mm hg. at constant temperature, what volume does the gas occupy when the pressure decreases to 700 mm hg?

79 ml

621 ml

487 ml

450 ml

14.
the expression p = kt is a statement of which of the following laws?

charles’s law

boyle’s law

avogadro’s law

gay-lussac’s law

15.
when pressure, volume, and temperature are known, the ideal gas law can be used to calculate which of the following?

the ideal gas constant

the chemical formula

molar amount

rate of effusion

16.
a sample of gas at 25°c has a volume of 6 l and exerts a pressure of 710 mm hg. how many moles of gas are in the sample?

0.23 mol

2.29 mol

2.73 mol

4.37 mol

17.
the ideal gas law combines boyle’s law, charles’s law, gay-lussac’s law, and what other law?

dalton’s law

graham’s law

raoult’s law

avogadro’s law

18.
at a constant volume, gas pressure is directly proportional to which of the following?

molar mass of the gas

temperature

number of moles of gas

volume

19.
the volume of a gas is 3.0 l when the temperature is 3.0°c. if the temperature is increased to 10.0°c without changing the pressure, what is the new volume?

2.93 l

0.90 l

3.08 l

10.0 l

20.
the value of r, the ideal gas constant, can be calculated from measured values of a gas’s pressure, volume, temperature, and which of the following?

molar amount

chemical formula

rate of diffusion

density

21.
all of the following equations are statements of the ideal gas law except which?

22.
the pressure of a quantity of gas at 30°c increases from 700 mm hg to 860 mm hg. what is the new temperature?

36.9°c

0°c

99.3°c

372°c

23.
a quantity of helium gas has a fixed volume, a pressure of 100 kpa, and a temperature of –35°c. when the temperature is decreased to –100°c, what is the new pressure of the helium gas?

72.7 kpa

35 kpa

137 kpa

286 kpa

24.
in the expression v = kn, n represents which of the following?

the ideal gas constant

a constant

avogadro’s number

the number of moles of gas

25.
standard temperature is defined as which of the following?

298 k

0 k

273 k

25°c

26.
a sample of gas at 25°c has a volume of 11 l and exerts a pressure of 660 mm hg. how many moles of gas are in the sample?

0.39 mol

2.56 mol

4.65 mol

3.90 mol

27.
boyle’s law states which of the following?

pressure and temperature are directly proportional.

pressure and volume are inversely proportional.

volume and pressure are directly proportional.

volume and temperature are directly proportional.

28.
standard pressure is the pressure exerted by a column of mercury exactly how high?

760 mm

1 m

273 mm

760 cm