Refrigerant-12 is throttled by a valve from the saturated liquid state at 800 kPa to a pressure

Question:

Refrigerant-12 is throttled by a valve from the saturated liquid state at 800 kPa to a pressure of 150 kPa at a mass flow rate of 0.5 kg/s. Assuming the surrounding conditions to be 100 kPa and 25oC, determine
(a) The rate of energy destruction (I) and
(b) The reversible power.