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Abnormal molar masses
Concepts tested here
- van't Hoff factor
All Questions
2011 AIPMT-PRE 1 question
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The van't Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectivelyvan't Hoff factor $i = \frac{\text{number of particles after dissociation or association}}{\text{number of particles taken}}$
Dissociation: one formula unit breaks into two or more particles, so the number of particles increases and i > 1.
Association: two or more molecules combine into one particle, so the number of particles decreases and i < 1.
Hence i is greater than one for dissociation and less than one for association.