-No, we are not skipping Gay-Lussac’s Law. It is the relationship between pressure and temperature. It looks exactly like Charles’ Law (just substitute pressure for volume). For that reason you should already know how to do it.

-We will move on to the Combined Gas Law. Consult your book for help. Remember to do your algebra before you plug values in. Also, Kelvin, not Celsius.

1. Before we hit the Combined Gas
Law, give two examples of Gay-Lussac’s Law. Be specific and explain
your example completely with words and a diagram if necessary.

2. Write the combined gas law in equation
form. Solve the combined gas law for V2.

3. A gas has a volume of 800.0 mL at minus
23.00 C and 300.0 torr. What would the volume of the gas be at 227.0 C
and 600.0 torr of pressure?

4. 500.0 liters of a gas are prepared at
700.0 mm Hg and 200.0 C. The gas is placed into a tank under high pressure.
When the tank cools to 20.0 C, the pressure of the gas is 30.0 atm. What
is the volume of the gas?

5. A gas occupies a volume of 34.2 mL at
a temperature of 15.0 C and a pressure of 800.0 torr. What will be the
volume of this gas at standard conditions?

6. A gas sample occupies 3.25 liters at
24.5 C and 1825 mm Hg. Determine the temperature at which the gas will
occupy 4250 mL at 1.50 atm.

7. If 10.0 liters of oxygen at STP are
heated to 512 C, what will be the new volume of gas if the pressure is
also increased to 1520.0 mm of mercury?

8. 2.00 liters of hydrogen, originally
at 25.0 C and 750.0 mm of mercury, are heated until a volume of 20.0 liters
and a pressure of 3.50 atmospheres is reached. What is the new temperature?

@9. If the absolute temperature of a given
quantity of gas is doubled and the pressure tripled, what happens to the
volume of the gas?

10. 73.0 mL of nitrogen at STP is heated
to 80.0 C and the volume increase to 4.53 L. What is the new pressure?

11. 500.0 mL of a gas was collected at
20.0 C and 720.0 mm Hg. What is its volume at STP?

12. The pressure of a gas is reduced from
1200.0 mm Hg to 850.0 mm Hg as the volume of its container is increased
by moving a piston from 85.0 mL to 350.0 mL. What would the final temperature
be if the original temperature was 90.0 C?

13. If a gas is heated from 298.0 K to
398.0 K and the pressure is increased from 2.230 x 10^3 mm Hg to 4.560
x 10^3 mm Hg what final volume would result if the volume is allowed to
change from an initial volume of 60.0 liters?

Copyright Alexplorer. Some items taken from or adapted from other materials. This page is free for use in a classroom setting.

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