Homework Help: Chemistry 2 Ap

Posted by jecce. on Tuesday, February 10, 2009 at 8:26pm.

Can someone please help me ?

What mass of glycerol must be dissolved in 200.0 g of water to give a solution with a freezing point of -1.50?

im not sure how to even start this problem. I think i would find the moles in water first, then the grams in glycerol after?

Pleaseee help!

Chemistry 2 Ap - DrBob222, Wednesday, February 11, 2009 at 11:34am
You want delta T = Kf*molality.
You know delta T and Kf, calculate molality.
Then molality = mols/kg solvent.
You know molality and kg solvent, calculate mols.
Then mols = g/molar mass.
You know mols and molar mass, calculate grams.

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