Kilogram block of ice and a temperature of -5 degrees Celsius is placed in a kilogram of water at a temperature of 25 degrees Celsius is 70 final temperature of the mixture is a specific heat capacity of ice is 2100

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).