A rigid, well-insulated tank contains a mixture of liquid-vapor (2 phase) Ammonia.

There is 0.0025 ft3 of saturated liquid and 1.5 ft3 of saturate vapor, initially at 40 psi. A

paddle wheel stirs the mixture until only saturated vapor at higher pressure remains in the

tank. KE and PE can be considered negligible. Taking the Ammonia as the system,

determine the amount of energy that has been transferred by work in Btu.