A Carnot refrigeration cycle is executed in a closed system in the saturated liquid-vapor mixture region using 1 kg of refrigerant-134a as the working fluid. The maximum and the minimum temperatures in the cycle are 22C and -4C, respectively. If the refrigerant is saturated liquid at the end of the heat rejection process, and the net work input to the cycle is 16 kJ, determine: a) The fraction of the mass of the refrigerant that vaporizes during the heat addition process. b) The pressure at the end of the heat rejection process.