1. A fixed mass of oxygen (O₂, molecular mass = 32 g/mol) is contained in a cylinder whose volume is 2.80 liters. The pressure is 148 atm when the temperature is 23^oC. Find the mass of oxygen in the cylinder.

 

a. 20 g

b. 80 g

c. 140 g

d. 280 g

e. 546 g

 

Answer: _____

 

 

2. A tire is filled with air at 15^oC to a gauge pressure of 2.2 x 10⁵ Pa. If the tire reaches a temperature of 38^oC, what will the new gauge pressure be inside it?

 

a. 2.4 x 10² Pa

b. 3.4 x 10³ Pa

c. 2.4 x 10⁵ Pa

d. 6.0 x 10⁷ Pa

e. 8.0 x 10⁹ Pa

 

Answer: _____

 

 

3. A fixed mass of an ideal gas having a volume of 2500 cm³ at 20^oC and absolute pressure of 65 atm expands until its volume is 4000 cm³ and its absolute pressure is 45 atm. Find its new temperature.

 

a. 20^oC

b. 42.3^oC

c. 51.6^oC

d. 61.8^oC

e. 80^oC

 

Answer: _____

 

 

4. A fixed mass of an ideal gas is in a container with a constant volume. By what factor will the pressure change if the absolute temperature is tripled?

 

a. 1/9

b. 1/3

c. 3

d. 9

 

Answer: _____

 

 

5. When using the ideal gas law, PV = nRT, _____________________________.

 

a. P can be gauge pressure

b. N can be in kilograms

c. T can be in degrees Celsius

d. none of the above

 

Answer: _____

 

 

6. For ideal gases, the ratio PV/T is ________________________________.

 

a. equal to Avogadro's number

b. equal to Boltzmann's constant

c. independent of the number of molecules

d. independent of the chemical nature of the molecules

 

Answer: _____

 

 

7. The volume of an ideal gas at constant pressure is proportional to its ____________.

 

a. Fahrenheit temperature

b. Celsius temperature

c. Absolute temperature

d. Molar mass

 

Answer: _____

 

 

8. If the pressure of gas is doubled and the temperature is constant, then the volume is what factor times the original?

 

a. 2

b. 1/2

c. 1/4

d. 4

 

Answer: _____

 

 

9. What is the volume of one mole of ideal gas at 300 K and at standard atmospheric pressure?

 

a. 23.2 L

b. 24.1 L

c. 24.6 L

d. 25.7 L

 

Answer: _____

 

 

10. An ideal gas in a container has a pressure of 2.50 atm and a volume of 1 m³ at a temperature of 30^oC. How many moles of gas are in the container?

 

a. 20 moles

b. 45 moles

c. 62 moles

d. 83 moles

e. 100 moles

 

Answer: _____