A liquid solution is formed by mixing 10 moles of aniline and 20 moles of phenol at a temperature where the vapour pressures of pure liquid aniline and phenol are 90 and 87 mm Hg, respectively. The po

Question

A liquid solution is formed by mixing 10 moles of aniline and 20 moles of phenol at a temperature where the vapour pressures of pure liquid aniline and phenol are 90 and 87 mm Hg, respectively. The possible vapour pressure of solution at that temperature is

Prashant Kotian · Accepted Answer

Correct answer: A. Aniline and phenol form strong H-bonds → negative deviation from Raoult's law. Ideal P = 90 × (1/3) + 87 × (2/3) = 88 mm Hg. Actual P < 88 mm Hg → only (a) 82 mm Hg is possible.

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