Acetic acid is found to have molar mass as 120 g `mol ^(-1).` Prove it.

Explanation

(i) In certain solvent, solute molecules associate to from a dimer. This reduces the total number of molecules formed in solution and as a result the calculated molar mass will be higher than the actual molar mass.
(ii) Acetic acid in benzene exist as a dimer

(iii) The molar mass of acetic acid calculate using colligative properties is found to be around 120 g `mol^(-1)` is two times of the actual molar mass `60 g mol ^(-1)`