1. The problem statement, all variables and given/known data 2. Relevant equations ΔEth = nCvΔT W = -∫ p dV pV = nRT 3. The attempt at a solution I tried to find the total change in thermal energy by finding the temperature change. I first found the initial pressure P1 = nRT/V = 32464.4 Pa Then I solved for the final pressure p1V12 = p2V22 p1V12 / V22 = p2 = 292179.6 Pa Then I found the final temperature T2 = pV/nR = 879 K What I wanted to do next was use ΔEth = nCvΔT to find the total thermal energy and then subtract the work to find the heat. Unfortunately, I don't know what Cv is equal to or how to find the work.