1-kg of water that is initially at 90oC with a quality of 10 percent occupies a spring-loaded piston - cylinder device, such as that in Fig. P4 - 21. This device is now heated until the pressure rises to 800 kPa and the temperature is 250oC. Determine the total work produced during this process, in kJ.

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Water, 90°C x=0.10 FIGURE P4-21