1. The problem statement, all variables and given/known data 2. Relevant equations W=-∫PdV ε=W/Q PV=nRT COP=Q/W 3. The attempt at a solution Using the first equation for work, I got W=-nrT*ln(3V1/V1) but I don't think that is right. Is this the wrong formula to use for this problem? My answer should be in terms of P1 and V1.