A large air separation plant takes in ambient air (79% N2, 21% O2 by mole) at 100 kPa, 20°C, at a rate of 25 kg/s. It discharges a stream of pure O2 gas at 200 kPa, 100°C, and a stream of pure N2 gas at 100 kPa, 20°C. The plant operates on an electrical power input of 2000 kW. Calculate the net rate of entropy change for the process.

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Air 79 % N2 21%02 P1 100 kPa T1 20 °C mi 25 kg/s P, 200 kPa T2 100°C P3 100 kPa T3-20 °C -++ pure O2 pure N2 -WIN-2000kW