1. The problem statement, all variables and given/known data I'm stuck on question A4 that is linked below. University won't provide me with any solutions. I have a TKP resit exam next month. 2. Relevant equations dU=dQ-PdV 3. The attempt at a solution Internal energy is equal to heat flow plus the work done. Work done is 0 because it's isochoric. So Internal energy is equal to the heat flow right? 20J.