Chem 101 - General Chemistry I » Spring 2021 » Chapter 9 Homework Quiz
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Question #1
Which of the following is not a postulate of the kinetic molecular theory?
A.
The moving particles undergo perfectly elastic collisions with the walls of the container.
B.
Gas particles have most of their mass concentrated in the nucleus of the atom.
C.
The forces of attraction and repulsion between the particles are insignificant.
D.
All of the above are postulates of the kinetic molecular theory.
Question #2
Under what conditions do real gases most closely approximate the behavior of ideal gases?
A.
low pressure and high temperature
B.
high pressure and low temperature
C.
high pressure and high temperature
D.
standard temperature and pressure
Question #3
You have a partially filled party balloon with 2.00 g of helium gas. You then add 3.26 g of hydrogen gas to the balloon. Assuming constant temperature and pressure, how many times bigger is the party balloon - comparing before and after the hydrogen gas has been added?
A.
6.47 times bigger
B.
3.23 times bigger
C.
5.26 times bigger
D.
4.23 times bigger
Question #4
At a constant temperature, a sample of a gas in a balloon that originally had a volume of 5.00 L and pressure of 626 torr has its volume changed to 6.72 L. Calculate the new pressure in torr.
A.
626
B.
364
C.
1077
D.
466
Question #5
A sample of a gas in a balloon has a volume of 2.22 L and temperature of 23.9 °C. Calculate the volume when the temperature is raised to 46.1°C at constant pressure.
A.
2.22
B.
2.07
C.
4.28
D.
2.39
Question #6
A sample of helium gas occupies 13.5 L at 23°C and 0.956 atm. What volume will it occupy at 40.°C and 0.956 atm?
A.
13 L
B.
0.0701 L
C.
none of these
D.
14.3 L
E.
23.5 L
Question #7
What volume is occupied by 22.0 g of methane, CH4, at 27°C and 1.59 atm?
A.
33.8 L
B.
21.2 L
C.
30.7 L
D.
1.91 L
E.
not enough data to calculate
Question #8
A compressed gas cylinder, at 135 atm and 23oC, is in a room where a fire occurs. The fire raises the temperature of the gas to 475oC. What is the new pressure in the cylinder?
A.
3.35 atm
B.
3.41 x 102 atm
C.
2.19 atm
D.
2.79 x 103 atm
E.
84.1 atm
Question #9
A gas is collected over water at a certain temperature. The total pressure is 755 torr. The vapor pressure of water at this temperature is 17 torr. The partial pressure of the gas collected is
A.
738 torr
B.
755 torr
C.
772 torr
D.
17 torr
E.
730 torr
Question #10
What volume of HCl(g) measured at STP can be produced from 3.56 g of H2 and excess Cl2 according to the following equation? H2 (g) + Cl2 (g) → 2HCl (g)
A.
119.6 L
B.
322 L
C.
159 L
D.
39.6 L
E.
79.1 L
Question #11
A 41.2-mL sample of H2 at STP would contain how many grams of hydrogen?
A.
1.84 g
B.
3.71 x 10-3 g
C.
1.84 x 10-3 g
D.
3.71 g
E.
1.1 x 103 g
Question #12
Gaseous chlorine is held in two separate containers at identical temperature and pressure. The volume of container 1 is 1.30 L, and it contains 6.70 mol of the gas. The volume of container 2 is 2.69 L. How many moles of the gas are in container 2?
A.
3.99 mol
B.
None of these
C.
13.9 mol
D.
3.24 mol
E.
7.21 x 10-2 mol
Question #13
A vessel with an internal volume of 17.2 L contains 2.80 g of nitrogen gas, 0.403 g of hydrogen gas, and 79.9 g of argon gas. what is the pressure (in atm) inside the vessel at 25 °C?
A.
3.27 atm
B.
0.274 atm
C.
118 atm
D.
967 atm
E.
0.306 atm
Question #14
Calculate the root-mean-square velocity for the O2 molecules in a sample of O2 gas at 40.1 °C. (R = 8.3145 J/K⋅mol)
A.
285.2 m/s
B.
176.8 m/s
C.
15.62 m/s
D.
494.0 m/s
E.
9.408 × 1026 m/s
Question #15
The molar mass of an unknown gas was measured by an effusion experiment. It was found that the unknown gas effused at a rate of 2.5 × 10−6 mol/hr, whereas nitrogen gas effused at a rate of 3.3 × 10−6 mol/hr. The molar mass of the gas is
A.
32 g/mol.
B.
37 g/mol.
C.
48 g/mol.
D.
24 g/mol.
E.
16 g/mol.
Question #16
What is the pressure of 2.50 mol of CO2 in a 1.00-L flask at 298 K when calculated using the van der Waals equation? For CO2, the values of the van der Waals constants are a = 3.59 L2-atm/mol2 and b = 0.0427 L/mol.
A.
59.5
B.
61.1
C.
5.74
D.
68.5
E.
46.0
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