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what the fully meaning of abnormal molar mass

Sometimes, the molar mass of a substance, calculated from the colligative properties is either higher or lower, due to dissociation or association of the molecules of the substance, than the expected molar mass. In such a case, the observed molar mass of a substance is known as abnormal molar mass of that substance.

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normal molar mass is the mass calculated experimentally

abnormal molar mass is the mass calculated by the formula it is observed when solution is non-ideal or when solute undergoes association or dissociation

http://www.askiitians.com/iit_jee-Solutions/Abnormal_colligative_properties

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Abnormal Molar Mass is the changed molar mass when solution shows deviation from its ideal behavior either showing (+)ve or (-)ve deviation . 

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