What is true about the van Laar equation
A. It can only be used as a predictive model and never as a correlative model.
B. Using predictive approaches to obtain the activity coefficients work best when the components of the mixture are strongly polar.
C. The solubility parameters, since they are parameters, are dimensionless.
D. Regular solution assumes the excess molar volume and excess molar internal energy is 0.
E. None of the above are true.
A. Incorrect. The van Laar equation can be used for both prediction from pure component properties, and correlation among mixture data.
B. Incorrect. This will probably cause the highest deviations from the predicted values.
C. Incorrect. As the solubility parameter is defined, is has dimensions. Solubility parameters (?) have units of (Pa)0.5, or traditionally cal0.5/cm1.5.
D. Incorrect. Regular solution assumes no excess molar volume or molar entropy.
E. Correct. Each statement is false for various reasons.
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