1.5 kg of air in a piston/cylinder assembly has initial temperature and pressure 27oC and 1.5 bar respectively. Then the system is heated in constant volume to 727oC (state 1-2) and then heated again constant pressure to 1227oC (state 2-3). Determine the amount of heat transfer during the whole process. (Use constant specific heat, cv=0.825 kJ/kg.K)