Work is completed as the steam expands, Chemical Engineering

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Steam at 400C, 100 bar in an insulated cylinder is rapidly decompressed to 10 bar, by unlocking the piston and permitting the gas to expand, with a constant external pressure of 10 bar applied to the piston. Find the final temperature T₂, and the entropy change S.

To solve the problem, ask yourself the following questions:

1) How much work is completed as the steam expands?
2) What does energy conservation tell you in this situation?

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