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 )