The approximate molality of ethylene glycol () in an aqueous solution which freezes at a temperature — Solutions and Colligative Properties Chemistry Question
Question
The approximate molality of ethylene glycol ($\text{C}_2\text{H}_6\text{O}_2$) in an aqueous solution which freezes at a temperature no higher than $-15^\circ\text{C}$ is ($K_f$ of water = $1.86^\circ\text{C kg mol}^{-1}$)
Answer: A
💡 Solution & Explanation
The freezing point depression is $\Delta T_f = 15^\circ\text{C}$. Using the formula $\Delta T_f = K_f \times m$, we have $15 = 1.86 \times m$. Solving for molality gives $m = 15 / 1.86 \approx 8.064 \text{ m}$. Therefore, correct answer is A.
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