\begin{align*} \text{Given:} & \\ \text{Osmotic pressure of CaCl}_2 \text{ solution} &= 0.605 \, \text{atm} \\ \text{Osmotic pressure of urea solution} &= 0.245 \, \text{atm} \\ \\ \text{To find:} & \text{The value of van’t Hoff factor} \\ \\ \text{Formulae:} & \pi = MRT, \pi = iMRT \\ \\ \text{Calculation for urea solution:} & \\ \pi &= MRT \\ 0.245 \, \text{atm} &= MRT \quad \ldots \text{(i)} \\ \\ \text{Calculation for CaCl}_2 \text{ solution:} & \\ \pi &= iMRT \\ 0.605 \, \text{atm} &= iMRT \quad \ldots \text{(ii)} \\ \\ \text{From equations (i) and (ii),} & \\ \frac{0.605}{0.245} &= \frac{iMRT}{MRT} \\ \therefore i &= 2.47 \\ \\ \text{The value of van’t Hoff factor is} & \, 2.47. \end{align*}