1. The problem statement, all variables and given/known data http://s9.postimage.org/5iw5rixyl/image.jpg (sorry doesn't let me embed) 2. Relevant equations P1V1=P2V2 and PV=nRT I know that Work done by gas from a --> b = (nRT)*Integral(V2/V1) My question is do i use PV=nRT to find N? and if T is constant (isothermal) what do I plug in for T when evaluating work? Using PV=nRT I got n= 14.440 when T=constant (1), is this correct? I appreciate all of your help.