Q.

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

0.73

0.74

0.039

answer is C.

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Detailed Solution

Given PA = 750 mm Hg∵ 373 K is boiling Point of water.Thus, PA∘=760 mm Hgm=P∘−PP×1000Msolvent ⇒10750×100018⇒0.74

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