Which of the following statements is true?
A. Binary liquid mixtures will phase split into two liquid phases when the ratio of the densities of the pure components is greater than 10.
B. Gibbs phase rule applies only to the liquid and vapor phase, but not to the solid phase.
C. For vapor-liquid-liquid equilibrium the fugacity of component i must be the same in all three equilibrium phases.
D. All of the above are true.
E. None of the above are true.
A. Incorrect. LLE formation is dictated by the minimization of the Gibbs free energy. If the system can minimize the Gibbs free energy by splitting into two liquid phases, then that is what will occur. If LLE occurs, however, the denser phase will be at the bottom.
B. Incorrect. The Gibbs phase rule applies to all systems and all phases.
C. Correct. This is the definition of phase equilibrium: the mixture fugacity of component i must be the same in the phases that it appears at equilibrium.
D. Incorrect. Only one answer is true.
E. Incorrect. At least one is true, possibly more. Try again.
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