# Work by a gas

1. Jan 27, 2010

### ronaldor9

1. The problem statement, all variables and given/known data

Consider 5.5L of a gas at a pressure of 3 atm in a cylinder with a movable piston. The external pressure is changed so that the volume changes to 10.5L. Calculate the work done.

Calculate the work if the process is done in two steps. At the end of the first step the volume is 7L and after the second step the volume is 10.5L

2. Relevant equations
W=PV?

3. The attempt at a solution

Not sure since the external pressure is not constant I don't think I can use W=PV to calculate work done.

Last edited: Jan 27, 2010