Question

what is abnormal molar mass

Answer 1

Here is ur answer mate!!

Molar masses that are lower or higher than expected values when calculated are called abnormal molar masses.

Abnormal molar masses depends upon the total number of moles particles either after dissociation or association of solute molecules in solvent or solution.

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Answer 2

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$\Large\bold\blue{Abnormal \:molar\:mass}$

The dissociation or association of solute molecules would alter the total number of particles present in the solution and hence affect the results of measured colligative properties. In such solutions, the value of the molar mass of the solute determined using colligative properties would be different from the actual molar mass, and it is called abnormal molar mass.