MEng 254 Students are performing a lab. A piston-cylinder system initially contains R134a 0.8 ^3, 1200kpa and 120 (state 1). The piston is also attached to a spring that behaves linearly. Now the system is opened, and the refrigerant is drained, going to 600kpa, 0.5^3 (state 2) . You are allowed to assume the enthalpy of the drained mass h_e is the average of enthalpies of states 1 and 2. Calculate (a) work of the process, (b) mass of R134a drained, and (c) final temperature of the system by applying the 1st law equation and by a guess-check process in the property table.