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Q.

Density of a 3 molar aqueous solution of ${Na}_{2} S_{2} O_{3}$ is 1.482 gm/ml. Calculate mole fraction of ${Na}_{2} S_{2} O_{3}$ in solution.

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a

0.051

b

0.06

c

0.03

d

0.072

answer is A.

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Detailed Solution

$\begin{array}{l} 3 ⟶ {Na}_{2} S_{2} O_{3} ⟶ 1000 mlsol \\ n_{B} = 3 W_{s} = 1482 g m \\ W_{B} = 3 \times (46 + 64 + 48) = 474 \\ x = \frac{3}{3 + 56} = 0.051 \end{array}$

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