2 kg of helium gas is initially contained in a rigid tank at 100 KPa and 27 C. The paddle wheel is now turned be an external electric motor until 500 KJ of work has been transferred into helium. During this process, heat is also transferred to helium, raising its temperature to 327 C. a.) Determine the boundary work per unit mass during the process (KJ) b.) Calculate the pressure of helium at the final state (KPa) c.) Calculate the amount of heat transfer during the process (KJ).