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October 26, 2014

Homework Help: Chemistry

Posted by Lauren on Monday, February 11, 2008 at 9:31pm.

Urea (NH2)2CO is dissolved in 100.0 g of water. The solution freezes at -0.085 degrees C. how many grams of urea were dissolved to make this solution.

delta T = Kf*molality
Plug in 0.085 for delta T, I assume you know Kf for water, calculate molality.
Then molality x kg solvent x molar mass = grams.
You have all but molar mass which can be calculated.

0.085 degrees C = 1.86 degrees C/m
divide 1.86 and m = .046

then the 100.0g water goes into kg right and then where do i go from here

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