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April 21, 2015

Homework Help: Chemistry

Posted by David on Sunday, February 19, 2012 at 4:34pm.

Given that the vapor pressure of water is 17.54 torr at 20 C, calculate the vapor-pressure lowering of aqueous solutions that are 2.40 m in (a) sucrose, C12H22O11, and (b) aluminum chloride. Assume 100% dissociation for electrolytes.
Sucrose Delta P = __ torr
Aluminum Chloride Delta P = __ torr

here's what I did..
2.4/(2.4+55.56) = 0.041
p = (0.41)(17.54) = 0.726 torr sucrose?

p = (3)(0.726) = 2.178 torr for aluminum chloride?

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