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Q.

Boiling point of water at 750 mm Hg is 99.63°C. Find the mass of water present in a solution containing 121.67 g sucrose, if this solution boils at 100°C (Kb(H2O)=0.52 K -Kg / mol)

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a

100 g

b

500 g

c

1000 g

d

50 g

answer is B.

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Detailed Solution

∆Tb=Kb.m 100-99.63=(0.52)(m) m=0.370.52 m=nsucroseWH2O(g)×1000=0.370.52 WH2O=121.67342×10000.37×0.52 WH2O=500 g

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