The osmotic coefficient of a non-electrolyte is related to the freezing point depression by the expr — Solutions and Colligative Properties Chemistry Question

Question

The osmotic coefficient of a non-electrolyte is related to the freezing point depression by the expression, $\phi = \Delta T_f / (m \cdot K_f)$. The depression in freezing point of 0.4 molal aqueous solution of sucrose is $0.93^\circ\text{C}$. The osmotic coefficient is ($K_f$ of water = 1.86 K-kg/mol)