Completely anhydrous acetic has molecular mass of 120. Explain.

Completely anhydrous acetic acid has molecular mass of 120. Explain.

A compound containing only carbon, hydrogen and oxygen has molecular mass of 44.0. On complete oxidation, it is converted into a compound of molecular mass 60.0. The compound is :

(A) Acetic acid in vapour state shows a molecular mass of 120. (R) It undergoes intermolecular hydrogen bond & forms a dimer.

Acetic acid has a molecular mass of 120 when dissolved in benzene. Why?

Why acetic acid in the vapour state has a molecular weight of 120 instead of 60 ?