The compositions of coexisting phases of ethanol(1) + toluene(2) at 55C are x 1 = 0.7186, and

Question:

The compositions of coexisting phases of ethanol(1) + toluene(2) at 55°C are x₁ = 0.7186, and y₁ = 0.7431 at P = 307.81 mmHg, as reported by Kretschmer and Wiebe, J. Amer. Chem. Soc., 71, 1793(1949). Estimate the bubble pressure at 55°C and x₁ = 0.1, using

(a) The one-parameter Margules equation

(b) The two-parameter Margules equation

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