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A rigid container with volume 200 L is divided into two equal volumes by a partition,  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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C.V. : A + B no change in volume. 1W2 = 0

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