Refrigerant-134a enters the evaporator

Refrigerant-134a enters the evaporator coils placed at the back of the freezer section of a household refrigerator at 120 kPa with a quality of 20 percent and leaves at 120 kPa and 20째C. If the compressor consumes 450 W of power and the COP the refrigerator is 1.2, determine

(a) The mass flow rate of the refrigerant and

(b) The rate of heat rejected to the kitchen air.