A piston-cylinder assembly containing water, initially a liquid at 50 ?F, undergoes a process at a constant pressure of 20 lbf/in2
to a final state where the water is a vapor at
300 ?F. Kinetic and potential energy affects are negligible. Determine the work and heat
transfer, in Btu/lb, for each of three parts of the overall process
(a) From the initial liquid state to saturated liquid state,
(b) From saturated liquid to saturated vapor and
(c) From saturated vapor to final vapor state, all at 20 lbf/in2

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.