CAS 65-85-0. Molecular Formula: C 7 H 6 O 2. Molecular Weight: 122.123 g/mol. Cas Number: 65-85-0. EINECS Number: 200-618-2. MDL Number: MFCD00002398. InChIKey: WPYMKLBDIGXBTP-FZOZFQFYCI.

Molecules of benzoic acid (C 6 H 5 COOH) dimerise in benzene. ‘w’ g of the acid dissolved in 30g of benzene shows a depression in freezing point equal to 2K. If the percentage association of the acid to form dimer in the solution is 80, then w is (Given that k f = 5 K kg mol-1, molar mass of benzoic acid = 122 g mol-1 1. 1.8 g 2. 1.0 g