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Q.

A solution of urea in water has boiling point of 100.15oC. Calculate the freezing point of the same solution if Kf and Kb for water are 1.87 K kg mol-1 and 0.52 K kg mol-1 respectively.

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a

−0.54oC

b

−0.44oC

c

−0.64oC

d

−0.34oC

answer is A.

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Detailed Solution

ΔTb=(100.15−100)=0.15oCWe know that, ΔTb=molality × KbMolality=ΔTbKb=0.150.52=0.2884ΔTf=molality×Kf=0.2884×1.87=0.54oCThus, the freezing point of the solution=−0.54oC.
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A solution of urea in water has boiling point of 100.15oC. Calculate the freezing point of the same solution if Kf and Kb for water are 1.87 K kg mol-1 and 0.52 K kg mol-1 respectively.