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Q.

Relative decrease in vapour pressure of an aqueous solution NaCl is 0.167, Number of moles of NaCl present in 180 g $H_{2} O$ is :

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a

4 mol

b

3 mol

c

1 mol

d

2 mol

answer is B.

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Detailed Solution

Here, the ratio of pressure,

$\frac{Δ P}{P^{\circ}} = x$

$\frac{Δ P}{P^{\circ}} = 0.167 = \frac{2 n}{2 n + 10} \Rightarrow n = 1 mole$

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