Given, mass of solute i.e. benzoic acid, W2 = 3.9 g
Molar mass of solute, M2 = 122 g
Mass of solvent i.e. benzene, W1 = 49 g
Depression in freezing point, ΔTf = 1.62 K
We know, ΔTf = i where i = Vant Hoff factor
i = 0.045
Since, the value of i<1, it shows molecular association.
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