5kg of liquid-vapor mixture of water is contained in a piston/cylinder device at 100°c. initially, 2 kg of the water is in the liquid phase. the piston is frictionless. heat is transferred to the water, and the piston which is resting on the stops, starts moving when the pressure inside reaches 200 kpa. heat transfer continues until the total volume increases by 20 %. a) show this process on p-v and t-v diagrams. b) determine the change in the internal energy, in kj, during each process. c) determine the work done, in kj, during each process.