Problem 3.5 Estimation of liquid diffusivity over the entire composition range. Experimental liquid-phase activity-coefficient data are given below in terms of natural log functions for ethanol(1)-benzene (2) at 45C. Estimate and plot diffusion coefficients for both components of the mixture versus composition using the equations of Vignes. The diffusivities at infinite dilution are 2.51105cm2/s for benzene and 3.4105cm2/s for ethanol. Wilson constants for the ethanol (1)/benzene(2) system at 45C are 12=0.124 and 21=0.523. Use these with the Wilson equation to predict liquid-phase activity coefficients over the composition range