A rigid, well-insulated tank contains a two-phrase mixture of ammonia with .0025ft^3 of saturated liquid and 1.5 ft^3 of saturated vapor, initially at 40lbf/in^2. A paddle wheel stirs the mixture until only saturated vapor at higher pressure remains in the tank.
(a) sketch p-V and T-V diagrams showing states and the processes.
(b) determine the amount of energy transferred by work in Btu.