A heat exchanger enters 25 kg of water vapor per minute as saturated steam at a pressure of 800 kPa and gives heat to the surrounding air at constant pressure, all of which comes out as saturated liquid. Accordingly, what is the change in the entropy of water in unit time? a) -2.523 kW/K b) -1.923 kW/K c) -4.616 kW/K d) -0.978 kW/K (please can you help quickly) thank you everything

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