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Q.

A solute A dimerizes in water. The boiling point of a 2 molal solution of A is 100.52ºC. The percentage association of A is ______. (Round off to the nearest integer.

[use: Kb for water = 0.52 K kg mol−1 Boiling point of water = 100°C]

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answer is 100.

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Detailed Solution

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ΔTb=Kb×i×m 100.52°C-100°C=i×0.52×2 i=0.520.52×2=0.5

For Dimerization:

α=i−11n−1 α=12−112−1=1 α%=100

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