5.38. Ten kmol per hour of air is throttled from upstream conditions of 25°C and 10 bar to a downstream pressure of 1.2 bar. Assume air to be an ideal gas with Cp (7/2)R. (a) What is the downstream temperature? (b) What is the entropy change of the air in J-mol-1-K-1? (c) What is the rate of entropy generation in W-K-l ?

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