Nitrogen at 600 kPa, 127◦C is in a 0.5-m³ insulated tank connected to a pipe with a valve to a second insulated initially empty tank of volume 0.25 m3, shown in Fig. P6.158. The valve is opened, and the nitrogen fills both tanks at a uniform state. Find the final pressure and temperature and the entropy generation this process causes. Why is the process irreversible?

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В A FIGURE P6.158 HX