Question 1

Which of the following statements best explains why gases are highly compressible compared to liquids and solids?

Accepted Answer

Gases consist of molecules that occupy a negligible fraction of the total volume.

Question 2

A weather balloon released at Earth's surface expands as it rises. Which gas law explains this phenomenon?

Accepted Answer

Boyle's Law

Question 3

Which equation correctly represents Boyle's Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 4

A sample of gas at constant pressure has its temperature increased from 273 K to 546 K. According to Charles's Law, what happens to its volume?

Accepted Answer

The volume doubles.

Question 5

Which of the following is the correct mathematical expression for Avogadro's Law?

Accepted Answer

$$V_1$$/$$n_1$$ = $$V_2$$/$$n_2$$

Question 6

A mixture of 6.00 g of $$O_2$$ and 9.00 g of $$CH_4 is $$placed in a 15.0-L vessel at 0°C. What is the total pressure in the vessel? (Use $$R = 0.08314 L$$·bar/mol·K)

Accepted Answer

$$113.64$$ kPa

Question 7

Which of the following is the ideal-gas equation?

Accepted Answer

$$PV = nRT$$

Question 8

At standard temperature and pressure (STP), what is the volume occupied by one mole of any ideal gas?

Accepted Answer

$$22.4 L$$

Question 9

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

Accepted Answer

Attractive and repulsive forces between molecules are significant.

Question 10

Which equation can be used to calculate the density of a gas?

Accepted Answer

$$d = MP/RT$$

Question 11

Dalton's Law of Partial Pressures states that:

Accepted Answer

The total pressure of a mixture of gases is the sum of the partial pressures of each gas.

Question 12

A 36 L automobile air bag is to be filled with nitrogen gas at 116.5 kPa and 26°C. How many grams of sodium azide ($$NaN_3) $$must be decomposed? (Molar mass $$NaN_3 = 65.0$ g/mol, R = 8.314$ kPa·L/mol·K)

Accepted Answer

$$72 g$$

Question 13

Which of the following conditions will cause a real gas to deviate most from ideal behavior?

Accepted Answer

High pressure and low temperature

Question 14

The van der Waals equation introduces two constants, $$a$$ and $$b. $$What do these constants account for?

Accepted Answer

$$a$$ accounts for molecular attraction, $$b$$ for molecular volume.

Question 15

Which of the following is the correct expression for mole fraction ($$X_1) in a $$mixture?

Accepted Answer

$$X_1$$ = \frac{$$n_1$$}{n_t}$$

Question 16

If the pressure, volume, and temperature of a gas all change for a fixed number of moles, which equation should be used?

Accepted Answer

$$\frac{P_1V_1}{T_1$} = \frac{P_2V_2}{T_2$}$$

Question 17

Which of the following statements about the gas constant $$R is $$TRUE?

Accepted Answer

The value of $$R$$ depends on the units of pressure, volume, and temperature used.

Question 18

According to kinetic-molecular theory, what happens to the average kinetic energy of gas molecules as temperature increases?

Accepted Answer

It increases.

Question 19

Which of the following is a real-world application of Dalton's Law of Partial Pressures?

Accepted Answer

Calculating the total pressure in a scuba tank containing oxygen and nitrogen.

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

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