You are interested in predicting the phase behavior of a binary mixture that contains an azeotrope. An accurate prediction of the azeotrope is important since it provides a distillation limit for separation. You have experimental Pxy data for the system at one temperature, but not for the temperature of interest. Thus, your plan is to correlate the experimental Pxy data for your system using an equation of state and a k₁₂ value at one temperature, and predict the behavior at the temperature of interest. Since, as you know, you have a choice of objective functions to use to obtain the “best fit” k₁₂ value, describe an approach to make this decision.