Homework Help: Chemistry

Posted by cc on Tuesday, February 9, 2010 at 11:09pm.

A 2.30 m solution of urea (CO(NH2)2; FW= 60.0) in water has a density of 1.14 g/mL. Calculate the percent mass of urea in this solution?

Chemistry - DrBob222, Tuesday, February 9, 2010 at 11:21pm
Do you need the density? If that is a small m then it is molality and not molarity and I don't think the density is needed,
2.30 m = moles/kg solvent
mols = 2.30
grams = moles x molar mass = 2.30 x 60 = ??
Total mass of solution = 1000 g + g urea = xx.
percent = (grams urea/total mass)*100
Check my thinking. Check my work.
Chemistry - CC, Tuesday, February 9, 2010 at 11:29pm
Thanks so much I just found this site and it is helping me more than ever...
Chemistry - Jeena, Wednesday, March 17, 2010 at 5:53pm
I also just found this site. DrBob222 is great!

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