http://www.badongo.com/pic/3538078 When this machine takes 0.2 moles of a one atomic ideal gas through this cycle, find the pressure and volume in 1, 2 and 3 OK, I start by finding V1 by using the ideal gas law. 4,92 L This is also V2 of course. Next, using the ideal gas law again, I find that P2 is 2 atm, or 203 kPa. We know that P3 is 1 atm, so I try to find V3 with the ideal gas law: V3 = nRT3/P3 = 0.2*8.3145*455/(101.3*10^3) = 7.47L This answer is, however, wrong. The correct answer is 7.94L. What is my mistake?