100 L of water at 50 °C and 250 kPa is contained in a piston-cylinder device. Heat is transferred to the waterwhile maintaining the pressure constant until all the liquid

is evaporated. Measurements show that during thisevolution, the change in enthalpy of the fluid is equal to the heat exchanged with the environment. a) Calculate the mass of water. b) Determine the total enthalpy change, AH. c) Calculate the work exchanged, and interpret its sign. d) Demonstrate whether the process is reversible or irreversible. e) Show the process on a T-v diagram with respect to saturation lines.