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Question

At 100C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb=0.52, the boiling point of this solution will be


A

102C

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B

103C

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C

101C

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D

100C

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Solution

The correct option is C

101C


Given WB=6.5g, WA=100g,
ps=732 mm, Kb=0.52, T0b=100C, p=760mm
ppsp0=n2n1760732760=n210018
n2=n2×1000760×18=0.204 mol
ΔTb=Kb×m
Tb100C=Kb×n2×1000wA(g)
Tb100C=0.25×0.2046×1000100=1.06
Tb=100+1.06=101.06C


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