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If benzoic acid (M=122 g mol^-1) is asso...

If benzoic acid `(M=122 g mol^-1)` is associated into a dimer when dissolved in benzene and the osmotic pressure of a solution of 6.1 g of benzoic acid in 100 mL benzene is 6.5 atm at `27^@ C` , then what is the percentage association of benzoic acid?
(Given : `R= 0.0821 L atm K^-1 mol^-1)`

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