Which of the following statements about evaluating the thermodynamic consistency of vapor-liquid equilibrium data is true?
A. The Direct Test is a necessary condition, but not sufficient of itself establish consistency.
B. The Direct Test uses the Gibbs-Duhem equation, but the Integral Test does not.
C. There is no “cut-off” to determine thermodynamic consistency, just measures that allow you to estimate the quality of the experimental data.
D. It is normally easier to evaluate Txy data than Pxy data.
E. None of the above are true.
A. Incorrect. This describes the Integral Test.
B. Incorrect. Both the Direct Test and Integral Test use the Gibbs-Duhem equation to evaluate thermodynamic data for consistency.
C. Correct. Measures like Van Ness’ index allow you to quantify consistency in a relative way, but there is no “cut-off.”
D. Incorrect. Because temperature is varying in Txy data, the impact of the change in the activity coefficient as a function of temperature must also be accounted for. This makes Txy data more of a challenge to evaluate.
E. Incorrect. One statement is true.
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