You are interested in finding the pressure at which the first bubble of vapor will form from a liquid mixture of methanol (1) and 2-methyl 1-propanol (2) (49% by mole methanol) at 50°C. The Margules parameters for this mixture are A₁₂ = 0.2565 and A₂₁ = 0.2404 (Gmehling and Onken,1977). Note that the vapor pressure of methanol is 422 mm Hg and that for 2-methyl-1-propanol is 56 mm Hg at 50°C. Find the pressure and vapor-phase composition.

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H3C CH3 -OH 2-methyl-1-propanol