Question

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 :

• A. $\frac{1}{1-n\alpha }$
• B. $1-\alpha +n\alpha$
• C. $1-\alpha +\frac{\alpha }{n}$
• D. $\frac{\alpha }{n}-1+\alpha$

Answer 1

The correct option is C $1-\alpha +\frac{\alpha }{n}$

$nA\rightleftharpoons An$

$1-\alpha$ $\frac{\alpha }{n}$

$i=1-\alpha +\frac{\alpha }{n}$

Hence, option C is correct.