Which of the following statements is true?
A. The molar volume of mixing for an ideal gas is normally a positive value.
B. While the molar volume of mixing can be a positive or negative quantity, the molar enthalpy of mixing must always be a positive quantity, according to the First Law of Thermodynamics.
C. The ideal solution would be a reasonable model for the binary mixture of 1-butene and 1-butanol.
D. According to the Gibbs phase rule, you can specify the temperature, pressure and composition independently for a binary vapor mixture.
E. None of the above are true.
A. Incorrect. The molar volume of mixing for an ideal gas is zero.
B. Incorrect. The First Law of Thermodynamics does not prevent a negative enthalpy of mixing. Many mixtures are known that absorb heat from their surroundings on mixing.
C. Incorrect. The different functional groups will cause significant deviations from ideal solution behavior.
D. Correct. Applying the Gibbs phase rule for C = 2, ? = 1; F = 2 – 1 + 2 = 3. Temperature, pressure and composition are all intensive variables.
E. Incorrect. One statement is accurate.
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