Apiston-cylinder device initially contains steam at 1 mpa, superheated by 20°c. the steam loses heat to the surroundings and the piston moves down, hitting a set of stops, at which point the cylinder contains saturated liquid water. the cooling continues until the cylinder contains water at 75°c. determine the initial temperature, the enthalpy change per unit mass by the time the piston first hits the stops, and the final pressure and the quality (if mixture). show the process on a t-v and a p-v diagram.