A large SSSF air separation plant takes in ambient air (79% N2, 21% O2 by volume) at

Question:

A large SSSF air separation plant takes in ambient air (79% N2, 21% O2 by volume) at 14.7 lbf/in 2, 70 F, at a rate of 2 lb mol/s. It discharges a stream of pure O2 gas at 30 lbf/in 2, 200 F, and a stream of pure N2 gas at 14.7 lbf/in 2, 70 F. The plant operates on an electrical power input of 2000 kW. Calculate the net rate of entropy change for the process.