Air undergoes two processes in series: Process 1-2: polytropic compression, with n = 1.3, from p1 = 100 kPa, v1 = 0.04 m3/kg to v2 = 0.02 m3/kg

Process 2-3: constant-pressure process to v3 = v1 Sketch the processes on a p-v diagram and determine the work per unit mass of air, in kJ/kg.