Steam distillation is carried out at a temperature where the sum of the partial vapour pressure of the organic liquid () and the partial vapour pressure of water () equals the atmospheric pressure. If

Question

Steam distillation is carried out at a temperature where the sum of the partial vapour pressure of the organic liquid ($p_1$) and the partial vapour pressure of water ($p_2$) equals the atmospheric pressure. If the atmospheric pressure is $760\ mm\ Hg$ and the vapour pressure of the organic liquid is $45\ mm\ Hg$ at the distillation temperature, what is the vapour pressure of water ($p_2$) in $mm\ Hg$ at this temperature?

Prashant Kotian · Accepted Answer

Correct answer: 715. In steam distillation, the mixture boils when the sum of the partial vapour pressures of the organic liquid and water equals the atmospheric pressure: . Thus, .

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