Combined Gas Law

Combines Charles's law, Boyle's law, and Gay-Lussac's law.


A gas occupies 4.31 L at a pressure of 0.755 atm. Determine the volume if the pressure is increased to 1.25 atm.

1. Write the combined gas law equation (take out the unmentioned or unneeded unit- temperature):

P1V1 / T1 = P2V2 / T2P1V1 = P2V2

2. and solve for V2:

P1V1 / P2 = V2

3. Insert the appropriate values in their proper places on the right-hand side of the above equation and carry out the necessary operations.

-Be sure to convert all the temperature to Kelvin. (+273)

V2 =(0.755 atm)(4.31 L) / (1.25 atm) = 2.60 L

Be sure to...

Convert temperature to Kelvins and Check Labels!!