____ pts. out of 62 possible pts.
= % = Name:
Advanced Chemistry: Quiz #3 (Gas Laws)
Multiple Choice: Circle the letter to the left
of the best answer. (4 pt. each)
1.
If the absolute temperature
of a gas is increased by a factor of two and the volume is increased by a
factor of two, the pressure of the gas will:
a. increase by a factor of 4
b. increase by a factor of 2
c. stay the same
d. decrease by a factor of 2
e. decrease by a factor of 4
2.
If the absolute temperature
of a gas is increased by a factor of two and the volume is reduced by a factor
of two, the pressure of the gas will:
a. increase by a factor of 4
b. increase by a factor of 2
c. stay the same
d. decrease by a factor of 2
e. decrease by a factor of 4
3. If
the absolute temperature of a gas is doubled and the volume stays the same, the
pressure of the gas will:
a. increase by a factor of 4
b. increase by a factor of 2
c. stay the same
d. decrease by a factor of 2
e. decrease by a factor of 4
4.
If samples of the five
odorous gases shown at the right are released simultaneously in one corner of
the lab, which will be the last gas to reach the opposite end of the lab?
a. Cl2
b. CH3SH
c. CS2
d. H2S
e. SO2
5.
If the pressure of a gas is
doubled and the absolute temperature of the gas is doubled and the volume of
the gas is reduced by a factor of two, then the average kinetic energy of the
molecules of the gas will:
a.
go down by a factor of 2
b.
stay the same
c.
go up by a factor of 2
d.
go up by a factor of 4
e.
go up by a factor of 8
6. A sealed, rigid container
holds pure argon at 3000.0 torr and 300.0 oC. What
will the pressure be if the container is cooled to 30.0 oC? (6 pts.)
7. What is the density of
krypton gas at STP? (6 pts.)
8. A container holds 20.0 g of
methane gas (CH4) and 30.0 g of chlorine gas at 25.0 oC. The
average velocity of the methane molecules is 570.0 m/sec. What is the average velocity of the chlorine
molecules? (6 pts.)
9. Hydrogen gas is collected
over water in a eudiometer by reacting iron with excess hydrochloric acid. (Iron(III) chloride
is also produced in this reaction.)
After the reaction stops, the water level inside the eudiometer is even
with the water level outside, and the volume reads 54.6 ml. The lab conditions are 723.2 torr and 32.0 oC. What was the mass of iron that was used? (12 pts.)
10. A sealed container holds
10.0 g of nitrogen gas and 40.0 g of helium gas at 60.0 oC. If the total pressure in the container is
650.0 torr, what is the partial pressure of the
nitrogen gas? (6 pts.)
11.
What is the pressure of the
argon in the gas space above the mercury inside the tube if the atmospheric
pressure of the air outside the tube (above the surface of mercury in the
beaker) is 726.5 torr and the temperature is 30.0 oC? The
tube is open at the bottom. (6 pts.)
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Vapor Pressure of Ice and
Water
T v.p. T v.p. T v.p.
(oC) (torr) (oC) (torr) (oC) (torr)
-10 1.95 18 15.5 80 355.1
-5 3.0 19 16.5 90 525.8
-2 3.9 20 17.5 95 633.9
-1 4.2 21 18.7 96 657.6
0 4.6 22 19.8 97 682.1
1 4.9 23 21.1 98 707.3
2 5.3 24 22.4 99 733.2
3 5.7 25 23.8 99.1 735.9
4 6.1 26 25.2 99.2 738.5
5 6.5 27 26.7 99.3 741.2
6 7.0 28 28.3 99.4 743.9
7 7.5 29 30.0 99.5 746.5
8 8.0 30 31.8 99.6 749.2
9 8.6 31 33.7 99.7 751.9
10 9.2 32 35.7 99.8 754.6
11 9.8 33 37.7 99.9 757.3
12 10.5 34 39.9 100.0 760.0
13 11.2 35 42.2 100.1 762.7
14 12.0 40 55.3 100.2 765.4
15 12.8 50 92.5 100.3 768.2
16 13.6 60 149.4 100.5 773.7
17 14.5 70 233.7 101.0 787.6
R = 0.08206 liter.atm/mol.K
1.00 atm
= 101,325 Pascals