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April 20, 2014

Homework Help: finding boiling points of solutions

Posted by Sar on Thursday, September 9, 2010 at 2:30pm.

What is the boiling point (in degrees Celsius ) of each of the solutions below? For water, Kb = 0.51 (Degrees C * kg)/mol The vapor pressure of water at 45.0C is 71.93 mm Hg.

1. A solution of 15.0g of urea, CH4N2O, in 164 g of water at 45.0 degrees C.
For this one, I've gone 100 + ((.25*1000)/(9.11)) and got 127.44 degrees C..
However, this is incorrect. What am I doing wrong?

2. A solution of 12.0g of LiCl in 164 g of water at 45.0C, assuming complete dissociation.
I've tried something similar but once again with incorrect results.

Any suggestions on what I am doing wrong/need to do?

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