When 2g of benzoic acid is dissolved in 25g of benzene, it shows a depression in freezing point equal to 1-62K. Molal depression constant (K_f) of benzene is 4.9 K kg mol^-1 and molecular weight of benzoic acid=122g/mol. What will be the percentage association of the benzoic acid?

(Benzoic acid forms dimer when dissolved in benzene.)

Solution

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