Which of the following statements is false?
A. The fugacity coefficient of component i in one liquid phase must be equal to the fugacity coefficient of component i in the other liquid phase at equilibrium.
B. The LLE curve, especially at low pressures, varies little with pressure.
C. Some systems can possess both a UCST and an LCST.
D. The region where a liquid mixture exhibits LLE is called the miscibility gap.
E. None of the above are false.
A. Correct. The fugacities (not the fugacity coefficients) of the components must be equal in both liquid phases.
B. Incorrect. This is true. We say that it is a “weak” function of pressure to indicate it is not totally independent of it, but the changes (especially for low-to-moderate pressures) will not strongly impact the LLE curve.
C. Incorrect. This is true. These are called closed loop miscibility gaps.
D. Incorrect. This is true. We can also call it an LLE dome, but “miscibility gap” is a common terminology as well.
E. Incorrect. One statement is false.
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