Air expands from P1=250 kPa, T1 = 420 K, and V1=1.7 m^3 to a final volume of V2=4.8 m^3 during a polytropic process with n=1.33. Find (a) the mass of air in Kg, (b) final pressure P2 in kPa, (c) temperature T2 in K, and (d) work W in kJ. Use the fact that the universal gas constant is Ru = 8.314 kJ/kmol-K and the molar mass of air is M=28.97 kg/kmol to answer this problem.