A rigid tank has a volume of 0.01 m3. It initially contains saturated water at a temperature of 200°C and a quality of 0.4. The top of the tank contains a pressure-regulating valve that maintains the vapor at constant pressure. This system undergoes a process whereby it is heated until all the liquid vaporizes. You may assume there is no pressure drop or heat transfer in the exit line. The surroundings are at 200°C. What is the entropy change of the universe?

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Water 3 MPa; 773 K- Tsurr = 293 K Initially: vacuum