Aclosed, rigid tank whose volume is 1 m3 contains refrigerant 134a, initially a two-phase liquid-vapor mixture at 10°c. the refrigerant is heated to a final state where temperature l$ 50°c and quality is 100% determine the mass of vapor present at the initial and final states, each in kg.

1kg of water contained in a piston-cylinder assembly undergoes two processes in series from an initial state where the pressure is 3.0 bar and the temperature is 150°c process 1-2: the water is compressed isothermally to a volume of 0.25 m^3 with 120 kj of work being done to the system. process 2-3: the water is heated at constant volume to a final pressure of 10 bar. a. find the change in internal energy for the system. b. calculate the amount of heat transferred, in kj. c. sketch both processes on a t-v diagram. (196.33 kj/kg, 76.33 kj)