### Determine the rate of heat rejection by treating the mixture

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Air, which may be considered as a mixture of 79 percent N2 and 21 percent O2 by mole numbers, is compressed isothermally at 200 K from 4 to 8 MPa in a steady-flow device. The compression process is internally reversible, and the mass flow rate of air is 2.9 kg/s. Determine the power input to the compressor and the rate of heat rejection by treating the mixture (a) as an ideal gas and (b) as a non-ideal gas and using Amagat's law.

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