Two kilograms of an ideal gas mixture consisting of 50% N2 and 50% O2 (by volume) are placed inside a piston–cylinder device. Initially the mixture has a volume of 0.45 m3 and a temperature of 300°C. The mixture expands until the volume is 0.65 m3. The surface temperature is 25°C. Determine the work done and entropy generation during the process and the final pressure and temperature of the mixture if (a) the expansion is isentropic, (b) the expansion follows the relationship Pv1.8 5 constant, and (c) the expansion is at constant pressure.
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