A rigid container with volume 200 L is divided into two equal volumes by a partition, shown in Fig. P6.151. Both sides contain nitrogen; one side is at 2 MPa, 200◦C and the other at 200 kPa, 100◦C. The partition ruptures, and the nitrogen comes to a uniform state at 70◦C. Assume the temperature of the surroundings is 20◦C. Determine the work done and the net entropy change for the process.

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A B N2 N2 20°C FIGURE P6.151