1. The problem statement, all variables and given/known data A heat engine uses a diatomic gas that follows the pV cycle shown in Figure. Part 2→3 is adiabat, part 3→1 is isotherm, V=1040 cm3, P=100 kPa, T1=212 K. Determine the pressure at point 2. Determine the volume at point 2. Determine the temperature at point 2. Find Ws for process 1→2. Find Q for process 1→2. Tries 0/9 Find ∆E for process 1→2. Tries 0/9 Find Ws for process 2→3. Tries 0/9 Find Q for process 2→3. 0 J Find ∆E for process 2→3. Find Ws for process 3→1. Find Q for process 3→1. Tries 0/9 Find ∆E for process 3→1. Tries 0/9 What is the thermal efficiency of this heat engine? (in percent) 2. Relevant equations 3. The attempt at a solution I know how to do the rest if I can find the temperature at point 2. I tried 2 different ways. 1. I tried using the Ideal Gas law PV=nRT and solved for mols at pt 1. Then tried using that for point 2 and then used PV=nRT but that didn't work. 2. Then I tried just simply using PV/T=PV/T and came up with the same answer and they are both wrong. What am I doing wrong?