a tank with 100 kg of ammonia is connected to a refrigeration loop, with a valve that opens to keep the loop at a constant pressure. the ammonia is initially 99% liquid, and the valve is located at the top such that only vapor exists the tank. the tank is un-insulated, and heat transfer keeps it at a constant temperature of 25C. the tank must re-filled when the pressure drops below its initial value.
a) how much mass is transferred to the refrigeration loop the tank is refilled?
b) how much heat is transferred to the tank during this time?