A piston-cylinder device initially contains a mixture of saturated water and saturated steam at 200kPa. The total mass is 0.5kg and the volume is 0.3m3. Now the fluid is heated up under the same pressure, until the volume doubles. Find (a) the initial temperature (b) the final temperature (c) the total internal energy change of the fluid during this process. (d) Also sketch the process on the P-v and I-v diagrams. including the initial state, the final state, and the path