Benzaldehyde and Benzoic AcidHard

Question

12.2 g of benzoic acid (Mw = 122) in 100 g benzene has depression in freezing point 2.6o; Kf = 5.3o kg mol-1; If there is 100% polymerzation., the number of molecules of benzoic acid in associated state is

Options

A.1
B.2
C.3
D.4

Solution

m (benzoic acid)

= 244 (twice of actual molecualr weight)

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