An ideal solution is obtained by dissolving moles of non-volatile, non-electrolyte solute in moles o — Solutions and Colligative Properties Chemistry Question
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 '$P^\circ$', then
Answer: A
💡 Solution & Explanation
Using Raoult's law, $P = P^\circ \frac{N}{N+n}$. Then $\frac{P^\circ}{P} = \frac{N+n}{N} = 1 + \frac{n}{N}$. Thus $\frac{P^\circ - P}{P} = \frac{n}{N}$. Therefore, correct answer is A.
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