1.
calculate the approximate volume of a 0.500 mol sample of gas at 15°c and a pressure of 1....
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
Answers: 2
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