Question 1

A barometer is used to measure atmospheric pressure. If the atmospheric pressure at sea level is 760 mm Hg, what is this pressure in atmospheres (atm)?

Accepted Answer

1 atm

Question 2

Which of the following statements best describes Boyle’s Law?

Accepted Answer

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

Question 3

A sample of gas occupies 2.58 L at 15°C and 1 atm. What volume will this gas occupy at 38°C and 1 atm?

Accepted Answer

2.91 L

Question 4

Which of the following is NOT a correct unit of pressure?

Accepted Answer

Joule (J)

Question 5

A 0.845 mol sample of nitrogen gas is at 315 K and 0.920 atm. What is its volume in liters? (Use R = 0.0821 L·atmmol·K)

Accepted Answer

23.8 L

Question 6

According to Avogadro’s Law, which of the following is true if the pressure and temperature are held constant?

Accepted Answer

The volume of a gas is directly proportional to the number of moles.

Question 7

A sample of methane gas has a volume of 38 mL at 5°C. It is heated to 86°C at constant pressure. What is the new volume?

Accepted Answer

49 mL

Question 8

Which of the following best explains why a barometer works to measure atmospheric pressure?

Accepted Answer

Atmospheric pressure pushes mercury up the tube until its weight balances the atmospheric force.

Question 9

If a gas sample is compressed from 4.0 L to 2.0 L at constant temperature, what happens to its pressure?

Accepted Answer

It doubles.

Question 10

Which of the following is the correct value for the molar volume of an ideal gas at STP (Standard Temperature and Pressure)?

Accepted Answer

22.4 L

Question 11

A gas sample contains 0.50 mol of O_{2} at 1 atm and 25°C. If all of this O_{2} is converted to O_{3} (ozone) at the same temperature and pressure, what is the volume of ozone produced?

Accepted Answer

8.2 L

Question 12

Which of the following is a correct rearrangement of the Ideal Gas Law to solve for pressure?

Accepted Answer

nRTV

Question 13

Which of the following is a real-world application of the gas laws?

Accepted Answer

A hot air balloon rising as the air inside is heated.

Question 14

If the temperature of a gas is doubled (in Kelvin) at constant pressure, what happens to its volume?

Accepted Answer

It doubles.

Question 15

Which of the following is the correct value and units for the universal gas constant R when using pressure in atm and volume in liters?

Accepted Answer

0.0821 L·atmmol·K

Question 16

A gas sample at 1.50 atm and 0°C has a volume of 8.56 L. How many moles of hydrogen are present? (R = 0.0821 L·atm/mol·K)

Accepted Answer

0.47 mol

Question 17

Which of the following best describes the relationship between temperature and kinetic energy for a gas?

Accepted Answer

As temperature increases, the average kinetic energy of the gas molecules increases.

Question 18

Which of the following is a correct conversion for 49 torr to atmospheres?

Accepted Answer

0.064 atm

Question 19

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

Accepted Answer

Gas molecules have strong attractive forces between them.

Gases and Gas Laws: Pressure, Gas Laws, and the Ideal Gas Law

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