1. The problem statement, all variables and given/known data A very simple question, but I can't figure it out. An ideal diatomic gas, with rotation but no oscillation, undergoes an adiabatic compression. Its initial pressure and volume are 1.20 atm and 0.200 m^3. Its final pressure is 3.60 atm. How much work is done by the gas? 2. Relevant equations Adiabatic, so Q=0 and ΔEint=W (because it is compression right?) ΔU=nCvΔT 3. The attempt at a solution Initial pressure = 1.22 * 10^5 pa Final pressure = 3.66 * 10^ 5 Pa V = 0.200 m^3 I tried to solve ΔU=5/2*(P2V2-P1V1) but I do not know V1.. Also U=-∫pdV right.. I am messing up, though its pretty simple I guess. Can anybody help me out please?