##### 1. What is the pressure of a mixture of CO_{2}, SO_{2} and H_{2}0 gases, if each gas has a partial pressure of 250 torr?

- 250 torr
- 500 torr
- 750 torr
- 1,000 torr

##### 2. A gas sample has a volume of 25.0 milliliters at a pressure of 1.0 atmosphere. If the volume increases to 50.0 milliliters and the temperature remains constant, the new pressure will be

- 1.0 atm
- 2.0 atm
- .250 atm
- .500 atm

##### 3. An increase of the temperature of a system at equilibrium favors the

- Endothermic reaction and decreases its rate
- Endothermic reaction and increases its rate
- Exothermic reaction and decreases its rate
- Exothermic reaction and increases its rate

##### 4. A sample of oxygen gas in a closed system has a volume of 200 milliliters at 600 K. If the pressure is held constant and the temperature is lowered to 300 K, the volume of the gas will be

- 100 ml
- 200 ml
- 300 ml
- 400 ml

##### 5. Which sample of water will have the highest water pressure?

- 10.0 mL at 62° C
- 20.0 mL at 52° C
- 30.0 mL at 42° C
- 40.0 mL at 32° C

##### 6. An assumption of the kinetic energy of gases is that the particles of a gas have

- Little attraction for each other and a significant volume
- Little attraction for each other and an insignificant volume
- Strong attraction for each other and a significant volume
- Strong attraction for each other and an insignificant volume

##### 7. What is the volume occupied by 2.0 moles of Ar(g) at STP?

- 22.4 L
- 44.8 L
- 89.6 L
- 179 L

##### 8. Which gas is least likely to obey the ideal gas laws at very high temperatures and very low temperatures?

- Kr
- Ne
- He
- Xe

##### 9. A gas at STP has a volume of 1.0 liters. If the pressure is doubled and the temperature remains constant, the new volume of the gas will be

- .25 L
- 2.0 L
- .50 L
- 4.0 L

##### 10. At 1 atmosphere of pressure, 25.0 grams of a compound at its boiling point is converted to a gas by the addition of 8,180 calories. What is the heat of vaporization for this compound, in calories per gram?

- 25.0 cal/g
- 327 cal/g
- 540 cal/g
- 8,140 cal/g