A rigid wall tank with volume of 2.5 m^3 initially contains ammonia at 20 degrees C, 150 kPa. The tank is attached to a supply line containing ammonia at 1200 kPa, 60 degrees C. Ammonia flows from the supply line into the tank until the tank contains saturated vapor at 20 degrees C. a. (13) How much ammonia flowed into the tank (kg)? b. (12) How much heat was transferred during the process (kJ)?