Question 1

Which of the following statements is NOT a postulate of the Kinetic Molecular Theory of gases?

Accepted Answer

Gas particles attract each other strongly at all times.

Question 2

A 2.00 L container holds 0.546 mol of an ideal gas at 300 K. What is the pressure inside the container? Use $$R = 0.0821 \ \mathrm{L \cdot atm \cdot $$mol^{-1}$$ \cdot K$$^{-1}$$}.$$

Accepted Answer

$$6.73 \ \mathrm{atm}$$

Question 3

Which of the following correctly describes Boyle's Law?

Accepted Answer

$$P \propto \frac{1}{V}$$

Question 4

A balloon contains 0.040 L of gas at 4°C and a pressure of 729 torr. To reduce its volume to 0.033 L at constant pressure, to what temperature must the balloon be cooled?

Accepted Answer

$$238 \ \mathrm{K}$$

Question 5

Which of the following is the correct value for 1 atm in mm Hg?

Accepted Answer

760 mm Hg

Question 6

A 22.4 L sample of gas at STP contains how many molecules?

Accepted Answer

$$6.02 	imes 10$$^{23}$$

Question 7

If the pressure of a gas is increased at constant temperature, what happens to its volume?

Accepted Answer

It decreases.

Question 8

A 3.00 L sample of a noble gas is stored at 874 torr and 298 K. What is the number of moles of gas present? ($$R = 0.0821 \ \mathrm{L \cdot atm \cdot $$mol^{-1}$$ \cdot K$$^{-1}$$})$$

Accepted Answer

$$0.143 \ \mathrm{mol}$$

Question 9

A gas sample has a mass of 21.0 g and occupies 2.00 L at 836 mm Hg and 25°C. What is its molecular weight? ($$R = 0.0821 \ \mathrm{L \cdot atm \cdot $$mol^{-1}$$ \cdot K$$^{-1}$$})$$

Accepted Answer

$$205 \ \mathrm{g/mol}$$

Question 10

Which of the following is the correct form of the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 11

A 500.0 mL gas sample at 25°C is heated to 50°C at constant pressure. What is the final volume?

Accepted Answer

544 mL

Question 12

If the volume of a gas container at 32.0°C changes from 1.55 L to 755 mL, what is the final temperature? (Assume constant pressure)

Accepted Answer

$$151 \ \mathrm{K}$$

Question 13

A 2.48 mole sample of gas is stored in a 30.0 L container at 1559 mmHg. What is the temperature in °C? ($$R = 0.0821 \ \mathrm{L \cdot atm \cdot $$mol^{-1}$$ \cdot K$$^{-1}$$})$$

Accepted Answer

$$104 \ \mathrm{°C}$$

Question 14

Hydrogen gas is collected over water at 25°C. The barometric pressure is 742.5 mm Hg and the vapor pressure of water is 23.8 mm Hg. What is the pressure of the dry hydrogen gas?

Accepted Answer

718.7 mm Hg

Question 15

Ammonia gas decomposes according to the equation: $$2NH_3(g) \rightarrow N_2$(g) + 3H_2(g). If 15.0 L of $$nitrogen is formed at STP, how many liters of hydrogen will be produced?

Accepted Answer

45.0 L

Question 16

What is the final pressure (expressed in atm) of a 3.05 L system initially at 724 mmHg and 298 K, that is compressed to a final volume of 2.51 L at 273 K?

Accepted Answer

$$0.86 \ \mathrm{atm}$$

Question 17

Which of the following statements about gas density is correct?

Accepted Answer

The gas density will decrease as temperature increases.

Question 18

What is the equivalent pressure of 965 mm Hg in units of atm?

Accepted Answer

1.27 atm

Question 19

Avogadro's Law is expressed as:

Accepted Answer

$$V \propto n$$

Question 20

Which of the following is NOT true about gases at STP?

Accepted Answer

STP is defined as 25°C and 1 atm.

Study Notes: Gases and the Kinetic Molecular Theory (Chapter 11, Introductory Chemistry)

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