An ideal solution is obtained by dissolving n moles of non-volatile, non-electrolyte solute in N moles of solvent. If the vapour pressure of solution is P and the vapour pressure of pure solvent is 'P

Question

An ideal solution is obtained by dissolving n moles of non-volatile, non-electrolyte solute in N moles of solvent. If the vapour pressure of solution is P and the vapour pressure of pure solvent is 'P°', then

Prashant Kotian · Accepted Answer

Correct answer: A. According to Raoult's law: (P^o - P) / P^o = n / (n + N). This means the vapour pressure of the solution is: P / P^o = N / (n + N). Dividing the first expression by the second gives: [(P^o - P) / P^o] / [P / P^o] = [n / (n + N)] / [N / (n + N)] => (P^o - P) / P = n / N.

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