A piston–cylinder device contains saturated water vapor initially at 1 Mpa and 2.5 m3. The saturated water vapor is allowed to release heat at constant pressure until the quality of the water mixture become 0.2. Show the process on a T- diagram with respect to saturation lines and determine (a) the mass of the water, (b) the final specific volume, (c) the amount of work transfer and (d) the amount of heat transfer.