2-40E A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 65 Btu of heat is transferred to the water, and heat losses from the side walls amount to 8 Btu. The piston rises as a result of evaporation, and 5 Btu of work is done by the vapor. Deter- mine the change in the energy of the water for this process. Determine the phase (saturated mixture, superheated vapor, or compressed liquid) of water at each of the states shown below. a. 250 F and 20 lbf/in^2 b. 50 lbf/in^2 and 8 ft^3/lbm c. 8 ft^3/lbm and 300 F d. 30 lbf/in^2 and 230 F e. 400 F and 0.02 ft^3/lbm f. 0.5 lbf/in^2 and 60 F