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Q.

Vapour pressure of water at 293K  is  17.54mm Hg and the vapour pressure of a solution of 108 g of a compound in 1000 g of water at the same temperature is 17.34 mm Hg. Molecular mass of the compound is(round off the answer to two digits after the decimal)

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answer is 170.49.

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Detailed Solution

                xB=p∘−psp∘

or        WBMAMBWA=p∘−psp∘

or  108×181000×MB=17.54−17.3417.54

Thus,  MB=170.49

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