3. Consider a gas with the properties of air. The gas begins at a state described...

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3. Consider a gas with the properties of air. The gas begins at a state described by a pressure of I5 atm and 600 K. If the gas is taken to a new state in which the temperature is 400 K and the pressure is 1 atm, determine the entropy change in two ways: 1. use an isentropic expansion from the first state down to a pressure of 1 atm and then reversible heating from the resulting temperature to the final 400 K state and 1. heat the gas reversibly at 15 atm until the final entropy is obtained and then expand the gas isentropically to the final pressure. Compare the results and sketch the two processes on at T-S diagram.

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