Question

For a substance $A$ when dissolved in a solvent $B$ shows the molecular mass corresponding to $A_3$. The van't Hoff factor will be:

• A. $1$
• B. $2$
• C. $3$
• D. $\frac{1}{3}$

Answer 1

The correct option is D $\frac{1}{3}$

$3A\to A_3$

3 moles of A associate to form 1 mole as A solute undergoes trimerization so van't Hoff factor $\frac{1}{3}$.

Hence, the correct option is $D$