For the ethanol(1)/chloroform(2) system at 50°C, the activity coefficients show interior extrema with respect to composition [see Fig. 13.4(e)].
(a) Prove that the van Laar equation cannot represent such behavior.
(b) The two-parameter Margules equation can represent this behavior, but only for particular ranges of the ratio A₂₁∕A₁₂. What are they?

Figure 13.4 (e)

Transcribed Image Text:

1.5 1.0 Fin In 12 0.5 F (e)