The van't Hoff factor $i$ is defined as

A $\frac{observed molar mass}{normal molar mass}$
B $\frac{number of moles after dissociation}{number of ions per formula unit}$
C $\frac{observed colligative property}{calculated colligative property (no dissociation or association)}$
D $\frac{calculated colligative property}{observed colligative property}$

Answer: C

By definition

i

is the ratio of the observed colligative property to the value calculated assuming the solute is a non-electrolyte that neither dissociates nor associates. Since colligative properties vary inversely with molar mass, the molar-mass ratio is the reciprocal,

i = M_{n or ma l} / M_{o b ser v e d}

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The van't Hoff factor i is defined as

Answer: C

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The van't Hoff factor $i$ is defined as