The vapour pressure of an aqueous solution of sucrose at 373 K is found to be 750 mm Hg. The molality of the solution at the same temperature will be :

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0.26

0.039

0.74

0.73

answer is C.

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Detailed Solution

Given P_A = 750 mm Hg
$∵$ 373 K is boiling Point of water.
Thus, $P_{A}^{\circ} = 760 mm Hg$
$\begin{aligned} m = (\frac{P^{\circ} - P}{P}) \times \frac{1000}{M_{solvent}} \\ \Rightarrow \frac{10}{750} \times \frac{1000}{18} \Rightarrow 0 .74 \end{aligned}$

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