Homework Help: chemistry

Posted by danielle on Sunday, January 31, 2010 at 11:26pm.

Automotive antifreeze consists of ethylene glycol, C2H6O2, a nonvolatile electrolyte. Calculate the boiling point and freezing point of a 25.0 mass percent of ethylene glycol in solution.

chemistry - DrBob222, Monday, February 1, 2010 at 1:10am
25% by mass means 25 g ethylene glycol + 75 g water (assuming the density of ethylene glycol is 1.0 g/mL which I doubt). If you have a density, you can change those numbers.
Then delta T = Kf*molality
molality = moles/kg solvent.
moles = g/molar mass.

Freezing point part is done the same way but use Kf instead of Kb.
Kf is 1.86 for water.
Kb is 0.51 for water.

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