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)
Answer: C
💡 Solution & Explanation
Substitute the given values into the provided formula: $\phi = \Delta T_f / (m \cdot K_f) = 0.93 / (0.4 \times 1.86) = 0.93 / 0.744 = 1.25$. Therefore, correct answer is C.
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