Question 1

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

Accepted Answer

Gas molecules are far apart, allowing them to be pushed closer together under pressure.

Question 2

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. If the pressure is increased to 2.0 atm at constant temperature, what will be the new volume of the gas? Use Boyle’s Law.

Accepted Answer

$$1.0\ \mathrm{L}$$

Question 3

Which of the following is the correct value for the gas constant $$R$$ when using pressure in atm, volume in liters, and temperature in Kelvin?

Accepted Answer

$$0.08206\ \mathrm{L\cdot atm/(mol\cdot K)}$$

Question 4

A weather balloon is filled with 5.0 L of helium at 1.0 atm and $$25\ ^\circ\mathrm{C}. If $$the balloon rises to a region where the pressure is $$0.50\ \mathrm{atm}$$ and the temperature is $$-25\ ^\circ\mathrm{C}$$, what is the new volume of the balloon? (Assume ideal gas behavior.)

Accepted Answer

$$7.3\ \mathrm{L}$$

Question 5

Which of the following best describes Avogadro’s Law?

Accepted Answer

At constant temperature and pressure, the volume of a gas is directly proportional to the number of moles.

Question 6

A 250.-mL flask contains carbon dioxide gas at $$1.3\ \mathrm{atm}$$ and $$31\ ^\circ\mathrm{C}. $$How many moles of CO$$_2$$ are present? (Use $$R = 0.08206\ \mathrm{L\cdot atm/(mol\cdot K)})$$

Accepted Answer

$$0.013\ \mathrm{mol}$$

Question 7

Which of the following is NOT a characteristic property of gases?

Accepted Answer

Gases have high molar masses.

Question 8

A gas sample has a pressure of $$760\ \mathrm{mm\ Hg}. $$What is this pressure in atmospheres?

Accepted Answer

$$1.0\ \mathrm{atm}$$

Question 9

A 1.0 L container holds nitrogen gas at $$2.0\ \mathrm{atm}$$ and $$300\ \mathrm{K}. If $$the temperature is increased to $$600\ \mathrm{K} at $$constant volume, what is the final pressure?

Accepted Answer

$$4.0\ \mathrm{atm}$$

Question 10

Which of the following equations correctly represents the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 11

A gas cylinder contains 0.50 mol of methane (CH$$_4) at$$ $$0\ ^\circ\mathrm{C}$$ and $$1.0\ \mathrm{atm}. $$What is the volume of the gas under these conditions?

Accepted Answer

$$11.2\ \mathrm{L}$$

Question 12

Which of the following is a correct conversion for pressure units?

Accepted Answer

$$1\ \mathrm{atm} = 760\ \mathrm{torr}$$

Question 13

A can of aerosol has a pressure of $$1.5\ \mathrm{atm} at$$ $$25\ ^\circ\mathrm{C}. $$What will the pressure be if the can is heated to $$450\ ^\circ\mathrm{C}$$? (Assume the volume is constant.)

Accepted Answer

$$2.7\ \mathrm{atm}$$

Question 14

Which of the following best describes the relationship between pressure and volume for a fixed amount of gas at constant temperature?

Accepted Answer

Pressure is inversely proportional to volume.

Question 15

A balloon contains 6.0 L of air at $$1.0\ \mathrm{atm}$$ and $$22\ ^\circ\mathrm{C}. It $$rises to a region where the pressure is $$0.45\ \mathrm{atm}$$ and the temperature is $$-21\ ^\circ\mathrm{C}. $$What is the final volume of the balloon?

Accepted Answer

$$9.2\ \mathrm{L}$$

Question 16

Which of the following is true about the behavior of real gases compared to ideal gases?

Accepted Answer

Real gases deviate from ideal behavior at high pressures and low temperatures.

Gases: Properties, Laws, and Applications

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