Calculating Minimum Molality of Antifreeze for -20F

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To calculate the minimum molality of antifreeze needed to protect an engine at -20F, one must first identify the components of the solution, with ethylene glycol as the solute and water as the solvent. The freezing point of pure water is 0°C (32°F), which is crucial for determining the freezing point depression. By applying the freezing point depression formula, the necessary molality can be calculated based on the desired freezing point of -20F. Understanding the density of ethylene glycol (1.12 g/mL) will also aid in the calculations. This process is essential for ensuring optimal antifreeze performance in cold temperatures.
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Homework Statement



Ethylene Glycol, C2H602, (d=1.12 g/mL)
Antifreeze solution will protect engine for temperatures as low as -20F

Homework Equations



What is the minimum molality of antifreeze solution required?

The Attempt at a Solution



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I assume you're mixing it with water. Which is the solvent and which is the solute? What is the freezing point of the pure solvent? Once you have that, you can determine the freezing point depression.
 
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