A piston - cylinder device contains steam initially at 1 MPa, 450oC, and 2.5 m3. Steam is

Question:

A piston - cylinder device contains steam initially at 1 MPa, 450oC, and 2.5 m3. Steam is allowed to cool at constant pressure until it first starts condensing. Show the process on a T v diagram with respect to saturation lines and determine
(a) The mass of the steam,
(b) The final temperature, and
(c) The amount of heat transfer.