Air is compressed steadily by a reversible compressor from an inlet state of 100kPa and 300K to an exit pressure of 900kPa. Determine the compressor work per unit mass for  a) The isentropic compression with k=1.4 b) A compressor with 85% isentropic efficiency c) Two-stage compression (100kPa to 300kPa, and 300 kPa to 900 kPa) with intercooling with an isentropic efficiency of 85% for both compressors

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