Tuesday
September 2, 2014

Homework Help: Chemistry

Posted by Jasmine on Thursday, May 23, 2013 at 1:03pm.

40.0 g of magnesium chloride (MgCl2) in 250.0 g of water at 22 C.Calculate a) the vapor pressure of this solution, b) the freezing point, c) the boiling point.

I know it is something like this, but I continue to get the incorrect answer.

A) 40.og Mgcl2*(1mol mgcl2/ 95.2 mgcl2)*(3 mol mgcl2/ 1mol MgCl2)= 1.261
250.o H20*(1mol h20/ 18.02h20)= 13.87
(13.87)/(13.87+1.261)=.9166--> .9166(23.80)= 21.81. That's not the correct answer, though.

C) I get 100.8 for Boiling point
B) and negative one for freezing.

Can someone please tell me how to do this correctly?

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