Q.

12.2 g of benzoic acid (Mw = 122) in 100 g benzene has depression in freezing point 2.6°; Kf = 5.2° kg mol-1. If there is 100% polymerzation, the number of molecules of benzoic acid in associated state is

Moderate

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By Expert Faculty of Sri Chaitanya

answer is 2.

(Detailed Solution Below)

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Detailed Solution

m (benzonic acid) =1000KbW1∆TbW2=244(twice of actual molecular weight)

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