Which of the following statements is true?
A. Partial molar quantities are functions of temperature and pressure of the system, but are independent of composition.
B. Excess molar volume can only be positive. A negative excess molar volume would contradict the Second Law of Thermodynamics.
C. When modeled as an ideal solution, the molar Gibbs free energy of mixing is equal to zero.
D. All of the above are true.
E. None of the above are true.
A. Incorrect. Partial molar properties are functions of temperature, pressure and composition.
B. Incorrect. This is based on a confused understanding of the Second Law of Thermodynamics. If the excess molar volume is negative, the entropy of the universe can still increase or decrease because of the modeled mixing.
C. Incorrect. Review Table 9-2. Gibbs free energy and entropy both have additional terms to account for spontaneity.
D. Incorrect. At least one is false.
E. Correct. All of them are false.
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