A gasoline engine has a piston/cylinder assembly containing 0.1 kg of air at 4 MPa and 1527C just after the combustion stage. The air then expands following a polytropic process of order n = 1.5 to a volume ten times greater. Find the work of expansion and the heat transfer using the heat capacity given in Table A5, then with the data from Table A7.1. What do you observe?

Answers should be : W = 70.56 kJ, Q (A5) = -17.7 kJ, Q(A7.1) = -36.9 kJ