The Combined Gas Law
Notes to the class:

-No, we are not skipping Gay-Lussacís Law.  It is the relationship between pressure and temperature.  It looks exactly like Charlesí 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-Lussacís 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?
 
 
 


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