Unit 7 Review Sheet
(complete on a separate sheet of paper)
Convert the following to mmHg
1. 3.34 atm
2. 9.8 atm
3. 89.0 kPa
4. 801 torr
5.
6.
7.
8.
Convert the following to kPa
699 mmHg
13.2 atm
0.676 atm
910 torr
Compute the answer to the following questions:
9. A 2.0 L balloon at a pressure of 1.0 atm on Earth’s surface ascends to 10km into the atmosphere, where
the pressure is 0.27 atm. What is the volume of the balloon at that altitude?
1. A flask containing 155L of hydrogen was collected at a pressure of 22.5kPa. Under what pressure would
the gas have a volume of 90.0L at constant pressure?
2. Gas in a balloon occupies 3.5L at 305K. What temperature will the balloon expand to 8.0L?
3. The balloon from the previous problem is dipped into liquid nitrogen that is at a temperature of 80K.
What volume will the gas in the balloon occupy at this temperature?
4. If the pressure exerted on a 300.mL sample of hydrogen gas at constant temperature is increased from
0.500 atm to 0.750 atm, what will be the final volume of the sample?
5. A helium balloon has a volume of 5.0L at a pressure of 1.0 atm. The balloon is released and reaches an
altitude of 6.5 km at a pressure of 0.50 atm. If the gas temperature remains the same, what is the volume
of the balloon?
6. For each of the following relationships, indicate the change. Explain why, using your knowledge of
kinetic molecular theory (energy and molecule movement).
a. As pressure increases (ie, add more books), volume __________________. Why?
b. As temperature decreases (ie, syringe in ice water), volume ____________. Why?
c. As volume increases, temperature _____________. Why?
7. Convert the following into Kelvins
a. 15 oC
b. –153 oC
c. 210 oC
d. –0.214 oC
8. A sample of gas is cooled from 87 oC to 75 oC, reaching a final volume of 13.7 liters.
a. Which law would you use to solve this problem?
b. What was the initial volume of the gas, in liters?
9. A child receives a balloon filled with 2.30L of helium from a vendor at an amusement park. The
temperature outside is 38 oC. What will be the volume of the balloon when the child brings it home to an
air-conditioned house at 22 oC?
10. A 1.5L pocket of air with a temperature of 295K rises in the air. What will be the volume of the air
pocket if the temperature decreased to 275K and the pressure is not changed?
11. A child brings an inflatable ball on a small plane. Before take-off the 2.00L ball has a pressure of 101.3
kPa. The pilot flies the plane at an altitude where the air pressure is 75.0 kPa. What is the volume of the
ball at this altitude if the temperature in the plane does not change?
Unit 7 Review Sheet
(complete on a separate sheet of paper)
Convert the following to mmHg
1. 3.34 atm (2538mmHg)
2. 9.8 atm (7448mmHg)
3. 89.0 kPa (668mmHg)
4. 801 torr (801mmHg)
Convert the following to kPa
5. 699 mmHg (93kPa)
6. 13.2 atm (1337kPa)
7. 0.676 atm (68.5kPa)
8. 910 torr (121kPa)
Compute the answer to the following questions:
9. A 2.0 L balloon at a pressure of 1.0 atm on Earth’s surface ascends to 10km into the atmosphere, where
the pressure is 0.27 atm. What is the volume of the balloon at that altitude? (7.41L)
1. A flask containing 155L of hydrogen was collected at a pressure of 22.5kPa. Under what pressure would
the gas have a volume of 90.0L at constant pressure? (38.75kPa)
2. Gas in a balloon occupies 3.5L at 305K. What temperature will the balloon expand to 8.0L? (697K)
3. The balloon from the previous problem is dipped into liquid nitrogen that is at a temperature of 80K.
What volume will the gas in the balloon occupy at this temperature? (0.918L)
4. If the pressure exerted on a 300.mL sample of hydrogen gas at constant temperature is increased from
0.500 atm to 0.750 atm, what will be the final volume of the sample? (0.2L)
5. A helium balloon has a volume of 5.0L at a pressure of 1.0 atm. The balloon is released and reaches an
altitude of 6.5 km at a pressure of 0.50 atm. If the gas temperature remains the same, what is the volume
of the balloon? (10L)
6. For each of the following relationships, indicate the change. Explain why, using your knowledge of
kinetic molecular theory (energy and molecule movement).
a. As pressure increases (ie, add more books), volume __________________. Why?
b. As temperature decreases (ie, syringe in ice water), volume ____________. Why?
c. As volume increases, temperature _____________. Why?
7. Convert the following into Kelvins
a. 15 oC (288K)
b. –153 oC (120K)
c. 210 oC (483K)
d. –0.214 oC (272.786K)
8. A sample of gas is cooled from 87 oC to 75 oC, reaching a final volume of 13.7 liters.
a. Which law would you use to solve this problem? (Charles’s Law)
b. What was the initial volume of the gas, in liters? (14.2L)
9. A child receives a balloon filled with 2.30L of helium from a vendor at an amusement park. The
temperature outside is 38 oC. What will be the volume of the balloon when the child brings it home to an
air-conditioned house at 22 oC? (2.18L)
10. A 1.5L pocket of air with a temperature of 295K rises in the air. What will be the volume of the air
pocket if the temperature decreased to 275K and the pressure is not changed? (1.40L)
11. A child brings an inflatable ball on a small plane. Before take-off the 2.00L ball has a pressure of 101.3
kPa. The pilot flies the plane at an altitude where the air pressure is 75.0 kPa. What is the volume of the
ball at this altitude if the temperature in the plane does not change? (2.7L)