Liquid Solution

If \(0.15 \mathrm{~m}\) aqueous solution of KCI freezes at \(-0.511^{\circ} \mathrm{C}\), calculate van't Hoff factor of KCI (cryoscopic constant of water is \(1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1})\)