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  4. If in a solvent, n simple molecules of solute combine to form an associated molecule, α is the degree of association, the van't Hoff's factor is equal to

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Q. If in a solvent, $n$ simple molecules of solute combine to form an associated molecule, $\alpha$ is the degree of association, the van't Hoff's factor is equal to

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Solution:

$\underset{(1-\alpha)}{n A} \rightleftharpoons \underset{\frac{\alpha}{n}}{An}$
$i=1-\alpha+\frac{\alpha}{n}$