Molecules of benzoic acid (C6H5COOH) dimerise in benzene. 'w' gram of the acid dissolved in 30 g of benzene shows a depression in freezing point equal to 2 K. If the percentage association of the acid to form dirmer in the solution is 80, then w (in g) is:
(Given that Kf = 5 K kg/mol, Molar mass of benzoic acid 122 g/mol)
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