3. A piston cylinder device contains air at initial temperature of 284.5C, which initially occupies a volume of 0.2 m at 400kPa. The air undergoes a reversible adiabatic expansion process until the volume is increased to 0.5 m. Assume air with constant specific heats: k=1.395, Cp = 1.013- kJ kj and R=0.287 kg.K kg.K' a) Determine the mass of the air. b) Determine the final temperature T2 and pressure P2 of the air. c) Determine the work done by the system in kJ? (Insulated Cylinder) Air