Q: Which equation is used to convert between the number of moles of a gas and its volume at STP?

$$1 \text{ mole} = 22.4 \text{ L}$$

Question 1

Which statement best describes the relationship between the volume and pressure of a gas at constant temperature and amount, according to Boyle’s Law?

Accepted Answer

The volume and pressure are inversely proportional.

Question 2

A weather balloon contains 2.0 moles of helium gas and has a volume of 44 L. If 3.0 moles of helium are added (totaling 5.0 moles), what will the new volume be, assuming constant temperature and pressure?

Accepted Answer

66 L

Question 3

A scuba tank contains O$$_2 at 0.450 $$atm and He at 855 mmHg. What is the total pressure in the tank in mmHg?

Accepted Answer

1195 mmHg

Question 4

Which equation represents the relationship described by Charles’s Law?

Accepted Answer

$$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$

Question 5

A sample of argon gas has a volume of 5.40 L at 15°C. If the temperature increases to 42°C at constant pressure, what is the new volume? (Use Charles’s Law)

Accepted Answer

6.19 L

Question 6

Which property of a gas is measured in atmospheres (atm), millimeters of mercury (mmHg), or pascals (Pa)?

Accepted Answer

Pressure

Question 7

During inhalation, what happens to the pressure inside the lungs?

Accepted Answer

It decreases, causing air to flow in.

Question 8

A gas sample at 25°C and 740 mmHg is cooled until the pressure drops to 620 mmHg. What is the new temperature in °C? (Use Gay-Lussac’s Law)

Accepted Answer

Question 9

Which equation is used to convert between the number of moles of a gas and its volume at STP?

Accepted Answer

$$1 	ext{ mole} = 22.4 	ext{ L}$$

Question 10

A container holds a mixture of gases: 2.0 atm of hydrogen and 4.0 atm of oxygen. What is the total pressure according to Dalton’s Law?

Accepted Answer

6.0 atm

Question 11

If the pressure of a gas is 467 mmHg, what is this pressure in atmospheres?

Accepted Answer

0.614 atm

Question 12

Which gas law explains why a container of nonstick cooking spray explodes when thrown into a fire?

Accepted Answer

Gay-Lussac’s Law

Question 13

A scuba diver inhales 50.0 mL of compressed air at 3.00 atm and 8°C. The air expands to 150.0 mL at 37°C in the lungs. What is the pressure in the lungs? (Use the combined gas law)

Accepted Answer

0.98 atm

Question 14

Which of the following is NOT a postulate of the kinetic molecular theory of gases?

Accepted Answer

Gas particles have strong attractive forces between them.

Question 15

What is the partial pressure of nitrogen in air if the total atmospheric pressure is 760 mmHg and nitrogen makes up 78.2% of air?

Accepted Answer

594 mmHg

Question 16

Which of the following best explains why hot air balloons rise when the air inside is heated?

Accepted Answer

The heated air increases the volume, making the balloon less dense.

Question 17

If the volume of a gas decreases from 12 L to 6 L at constant temperature, what happens to the pressure?

Accepted Answer

Pressure increases.

Question 18

Which unit is NOT commonly used to measure gas pressure?

Accepted Answer

Kelvin (K)

Question 19

At STP, what is the volume occupied by 2 moles of any gas?

Accepted Answer

44.8 L

Question 20

Which equation represents Avogadro’s Law?

Accepted Answer

$$\frac{V_1$}{n_1$} = \frac{V_2$}{n_2$}$$

Chapter 8: Gases – Properties, Laws, and Applications

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