Question

The substance A when dissolved in solvent B shows the molecular mass corresponding to $A_3$. The vant Hoff factor will be

• A. 1
• B. 2
• C. 3
• D. 1/3

Answer 1

Answer: (D)

Van't Hoff factor.
$i=\frac{Normalmol,mass}{Observedmol.mass}$
As the solute associates in solution, and gives mass
$A_3\therefore i=\frac{A}{3A}=1/3$