A piston/cylinder device keeping a constant pressure has 1 kg water at 20◦C and 1 kg of water at 100◦C, both at 500 kPa separated by a thin membrane, shown in Fig. P6.128. The membrane is broken and the water comes to a uniform state, with no external heat transfer. Find the final temperature and the entropy generation for the process.

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B A -F = constant FIGURE P6.128