Which of the following statements about activity coefficients is true?
A. The activity coefficient of a component in a mixture will go to 1 when the composition of that component in a mixture goes to 1.
B. The infinite dilution activity coefficient of component 1 in component 2 is the same as the infinite dilution activity coefficient of component 2 in component 1.
C. The activity coefficient of a component in a mixture can never be less than 1.
D. For the 2-parameter Margules equation, the infinite dilution activity coefficient values are the same for both substances.
E. None of the above are true.
A. Correct. At a mole fraction of 1, the entire mixture is a pure component, which must be an ideal solution, which in turn must have an activity coefficient of 1.
B. Incorrect. The 1-parameter Margules equation requires this, but it is not true in general.
C. Incorrect. An activity coefficient less than one simply means there are negative deviations from ideal solution.
D. Incorrect. This does not have to be the case, see Figure 11-6.
E. Incorrect. One, and only one answer, is true.
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