Liquid Solution

A non-volatile solute, '\(A\)' tetramerises in water to the extent of \(80 \%.\) \(2 .5 \mathrm{~g}\) of '\(A\)' in \(100 \mathrm{~g}\) of water, lower the freezing point by \(0.3^{\circ} \mathrm{C}\). The molar mass of '\(A\)' in \(\mathrm{g}\) is \(\left(K_f\right.\) for water \(=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1})\)