2 m^3 of air in a rigid and insulated container that is fitted with a paddle wheel assembly. The air starts at 300 K and 200 kPa. The paddle wheel does 750 kJ of work on the system. Assuming the air behaves as an ideal gas with cv= 0.72 kJ/kg-K, find (a) the mass of the air, (b) the final temperature of the air, and (c) the entropy produced.