Exactly of an unknown, non-electrolyte solute dissolved in of benzene lowered the freezing point of — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

Using the depression in freezing point formula: $\Delta T_f = K_f \times \frac{w_{solute} \times 1000}{M_{solute} \times W_{solvent}}$. Rearranging algebraically to solve for $M_{solute}$ gives $M_{solute} = \frac{5.12 \times 1.00 \times 1000}{0.40 \times 50} = \frac{5120}{20} = 256\text{ g mol}^{-1}$.