6.0 g of urea (molecular weight : 60) was dissolved in 9.9 moles of water. If the vapour pressure of pure water is P^o, the vapour pressure of solution is:

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0.10 P^o

0.99 P^o

0.90 P^o

1.10 P^o

answer is D.

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Detailed Solution

$\begin{aligned} \frac{P^{\circ} - P}{P^{\circ}} = x_{solute} or \frac{P^{\circ} - P}{P^{\circ}} = \frac{n}{n + N} \\ \Rightarrow \frac{0 .1}{0 .1 + 9 .9} \Rightarrow 0 .01; P = 0 .99 P^{\circ} \end{aligned}$

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