a) One mole of an ideal gas is compressed from [T1, Vi] to [T2, V2]. i. Starting with DQrev/T, develop an expression for the entropy change of the gas.T ii. What is the total entropy change? b) What is the operating temperature and pressure of a separator of a liquid/ vapor system of benzene (1) / ethylbenzene (2) that must provide at equilibrium mol fractions of X1= 0.25, y1= 0.80? Consider that the mixture behaves as an ideal solution. Please, use the Antoine's constants found in the textbook "Introduction to Chemical Thermodynamics" by Smith found on Canvas.

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