A cylinder is fitted with a piston has an initial volume of 0.1 m3 and contains nitrogen at 150 kPa, 25 oC. The piston is moved, compressing the nitrogen until the pressure is 1 MPa and the temperature is 150 oC. During this compression process heat is transferred from the nitrogen, and the work done on the nitrogen is 20 kJ. Determine the amount of this heat transfer