Question 1

A weather balloon is filled with 5.00 L of helium at 1.00 atm and 25°C. If the balloon rises to an altitude where the pressure is 0.500 atm and the temperature is -15°C, what will be the new volume of the balloon? (Assume ideal gas behavior.)
Correct answer: 9.86 L

Accepted Answer

9.86 L

Question 2

Which of the following statements best describes Boyle's Law?
Correct answer: At constant temperature, the pressure and volume of a gas are inversely proportional.

Accepted Answer

At constant temperature, the pressure and volume of a gas are inversely proportional.

Question 3

A scuba diver uses a tank with a volume of 12.0 L filled with air at a pressure of 200 atm. If the diver releases air until the tank pressure drops to 50.0 atm at constant temperature, what volume of air at 1.00 atm (surface pressure) has been released?
Correct answer: 1,800 L

Accepted Answer

1,800 L

Question 4

Which of the following is NOT a correct conversion for standard atmospheric pressure?
Correct answer: 1 atm = 1000 torr

Accepted Answer

1 atm = 1000 torr

Question 5

A sample of nitrogen gas occupies 2.50 L at 300 K and 1.00 atm. How many moles of nitrogen are present? (R = 0.0821 L·atm/(mol·K))
Correct answer: 0.101 mol

Accepted Answer

0.101 mol

Question 6

A hospital stores oxygen at 25°C and 150 atm in a 40.0 L tank. If 5.00 moles of oxygen are withdrawn and the temperature remains constant, what is the new pressure in the tank? (Assume ideal gas behavior.)
Correct answer: 131 atm

Accepted Answer

131 atm

Question 7

Which scenario best illustrates Avogadro's Law?
Correct answer: Doubling the number of moles of gas in a container at constant temperature and pressure doubles the volume.

Accepted Answer

Doubling the number of moles of gas in a container at constant temperature and pressure doubles the volume.

Question 8

A tire is inflated to a pressure of 32.0 psi at 20°C. On a hot day, the temperature inside the tire rises to 50°C. Assuming the volume remains constant, what is the new pressure in psi? (1 atm = 14.7 psi)
Correct answer: 35.2 psi

Accepted Answer

35.2 psi

Question 9

Which of the following is a key requirement when using the gas laws to solve for unknowns?
Correct answer: All units must be consistent and temperatures must be in Kelvin.

Accepted Answer

All units must be consistent and temperatures must be in Kelvin.

Question 10

A 10.0 L container holds 0.500 mol of argon gas at 27°C. What is the pressure inside the container? (R = 0.0821 L·atm/(mol·K))
Correct answer: 1.36 atm

Accepted Answer

1.36 atm

Question 11

A laboratory experiment requires 250 mL of oxygen gas at 1.00 atm and 0°C. What volume will this gas occupy at 2.00 atm and 25°C?
Correct answer: 119 mL

Accepted Answer

119 mL

Question 12

Which of the following best explains why a barometer is used to measure atmospheric pressure?
Correct answer: It measures the force exerted by air molecules as they strike surfaces.

Accepted Answer

It measures the force exerted by air molecules as they strike surfaces.

Question 13

A gas sample at 2.00 atm and 300 K occupies 4.00 L. If the pressure is reduced to 1.00 atm and the temperature is increased to 400 K, what is the new volume?
Correct answer: 10.7 L

Accepted Answer

10.7 L

Question 14

Which of the following is a common misconception when applying Charles' Law?
Correct answer: Assuming volume and temperature are inversely proportional.

Accepted Answer

Assuming volume and temperature are inversely proportional.

Question 15

A 2.00 L flask contains 0.100 mol of methane gas at 27°C. What is the pressure in the flask? (R = 0.0821 L·atm/(mol·K))
Correct answer: 1.22 atm

Accepted Answer

1.22 atm

Question 16

A patient receives 500 mL of oxygen gas at 1.00 atm and 20°C. If the gas is delivered to the lungs at 37°C and 0.950 atm, what volume does the gas occupy in the lungs?
Correct answer: 563 mL

Accepted Answer

563 mL

Question 17

Which of the following best describes the relationship between pressure and volume for a fixed amount of gas at constant temperature?
Correct answer: They are inversely proportional.

Accepted Answer

They are inversely proportional.

Question 18

A gas cylinder contains 3.00 mol of helium at 5.00 atm and 300 K. If 1.00 mol of helium is removed and the temperature and volume remain constant, what is the new pressure?
Correct answer: 3.33 atm

Accepted Answer

3.33 atm

Question 19

Which of the following is a real-world application of the ideal gas law?
Correct answer: Calculating the amount of air needed to inflate a car tire to a specific pressure.

Accepted Answer

Calculating the amount of air needed to inflate a car tire to a specific pressure.

Question 20

A sample of gas has a volume of 1.00 L at 300 K and 1.00 atm. If the number of moles is doubled at constant temperature and pressure, what is the new volume?
Correct answer: 2.00 L

Accepted Answer

2.00 L

Gas Laws and Properties of Gases

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