Which of the following statements about LLE is true?
A. In a plot of the molar Gibbs free energy of mixing of a binary mixture as a function of a mole fraction, the two local minima in the plot (not at the pure component endpoints) will define the composition of the equilibrium liquid phases.
B. The 1-parameter Margules equation cannot predict a miscibility gap for a binary liquid mixture, but the 2-parameter Margules equation can.
C. At extreme conditions of temperature or pressure, the ideal solution model can predict a miscibility gap for a binary liquid mixture.
D. All of the above are true.
E. None of the above are true.
A. Incorrect. The tangent line drawn to strike the curve at two positions is not required to (and rarely does) strike the curve at local minima.
B. Incorrect. Both Margules equations can predict a LLE, as shown in Chapter 13.
C. Incorrect. The ideal solution model predicts zero excess Gibbs energy. The stability criterion will always be fulfilled and the mixture will always be shown to be stable by this model.
D. Incorrect. At least one is false. Try again.
E. Correct. Each is false.
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