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A cylinder fitted with a frictionless piston contains water at 300 kPa and 200 degrees C, at which point the volume is 0.2 m^3. The piston is now moved slowly compressing the water to a pressure of 700 kPa. During this process PV^(0.9) = constant. Assuming that the room temperature is 20 degrees C, show that the process does not violate the second law, by evaluating the entropy produced.
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a combustion engineer wishes to produce an inert mixture to replace normal air. she will do that using a mixture of n2
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