Question 1

Which of the following statements about gases is FALSE?

Accepted Answer

Because liquid water and liquid carbon tetrachloride do not mix, neither do their vapors.

Question 2

A diver is 31.0 m below the surface of water (density $$1.00 	imes 10^3$ \ \mathrm{kg/m^3$}) $$where atmospheric pressure is 98 kPa. What is the total pressure on the diver in kPa? ($$g = 9.81 \ \mathrm{m/s^2$}$$, $$1 \ \mathrm{Pa} = 1 \ \mathrm{kg/(m \cdot s^2$)})$$

Accepted Answer

398 kPa

Question 3

A gas is collected in a flask attached to an open-end manometer. The atmospheric pressure is 764.7 torr. The mercury level in the open arm is 136.4 mm and in the flask arm is 103.8 mm. What is the pressure of the gas in the flask in torr?

Accepted Answer

797.3 torr

Question 4

Which of the following correctly expresses Boyle’s Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 5

A 35.4 L oxygen cylinder is at 15.16 GPa. If the oxygen is transferred to a container at 101.3 kPa and constant temperature, what volume will it occupy?

Accepted Answer

5,300,000 L

Question 6

Which of the following is NOT an assumption of the kinetic-molecular theory of gases?

Accepted Answer

Gas molecules attract and repel each other strongly.

Question 7

What is the density of carbon tetrachloride vapor ($$\mathrm{$$CCl_4$$}$$, $$M = 153.8 \ \mathrm{g/mol}) at 95.19 $$kPa and 125°C? ($$R = 8.314 \ \mathrm{L \cdot kPa/(mol \cdot K)})$$

Accepted Answer

4.44 g/L

Question 8

A mixture of 6.00 g O$$_2$$ and 9.00 g CH$$_4 is $$placed in a 15.0-L vessel at 0°C. What is the total pressure in the vessel? ($$R = 8.314 \ \mathrm{L \cdot kPa/(mol \cdot K)})$$

Accepted Answer

113.6 kPa

Question 9

According to Dalton’s Law, the total pressure of a gas mixture is:

Accepted Answer

$$P_t = P_1$ + P_2$ + P_3$ + \ldots$$

Question 10

A synthetic atmosphere contains 18.0 mol% O$$_2 at a $$total pressure of 99.33 kPa. What is the partial pressure of O$$_2$$?

Accepted Answer

17.88 kPa

Question 11

Which equation describes the relationship between the root-mean-square speed ($$u_{rms}) of a $$gas and its molar mass ($$M$$)?

Accepted Answer

$$u_{rms} = \sqrt{\frac{3RT}{M}}$$

Question 12

Which of the following gases will effuse most rapidly under identical conditions?

Accepted Answer

Hydrogen ($$\mathrm{H_2$})$$

Question 13

Which of the following best explains why real gases deviate from ideal behavior at high pressures?

Accepted Answer

The volume of gas molecules becomes significant compared to the container volume.

Question 14

Which equation is used to correct for non-ideal behavior in real gases?

Accepted Answer

$$\left(P + \frac{n^2$a}{V^2$}\right)(V - nb) = nRT$$

Question 15

A hospital air bag is to be filled with 36 L of N$$_2 at 116.5 $$kPa and 26°C. How many grams of NaN$$_3$$ ($$M = 65.01 \ \mathrm{g/mol}) $$are needed for the reaction $$2\mathrm{$$NaN_3$$}(s) \rightarrow 2\mathrm{Na}(s) + 3\mathrm{N_2$}(g)$$?

Accepted Answer

53.3 g

Question 16

If the temperature of a fixed amount of gas is doubled at constant pressure, what happens to the volume?

Accepted Answer

It doubles.

Question 17

Which of the following is the correct expression for the density of a gas using the ideal gas law?

Accepted Answer

$$d = \frac{PM}{RT}$$

Question 18

A gas mixture contains 0.5 mol N$$_2$$, 0.3 mol O$$_2$$, and 0.2 mol CO$$_2. If $$the total pressure is 1.0 atm, what is the partial pressure of O$$_2$$?

Accepted Answer

0.3 atm

Question 19

Which of the following best describes effusion?

Accepted Answer

The escape of gas molecules through a tiny hole into an evacuated space.

Chapter 10: Gases – Properties, Laws, and Real Behavior

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