A binary liquid mixture can be described by the 1-parameter Margules equation, where A = 1.3. What is the value for the activity coefficient of the second component in the mixture when x1 = 0.3?
A. 1.000
B. 1.300
C. 1.124
D. 1.891
E. 0.637
A. Incorrect. The system is not an ideal solution. If it were, A would have to equal zero, as was explained in the beginning of Section 11.6.
B. Incorrect. The A parameter cannot be directly equated to any activity coefficients.
C. Correct. Equation 11.82 to solve for the requested information using this using the data.
D. Incorrect. You mixed up your mole fractions. Carefully review Equation 11.82, especially the subscripts, and fix the mistake.
E. Incorrect. You are making a severe mistake somewhere. The activity coefficient cannot be less than one if the A parameter is positive.
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