Homework Help: chemistry - vapor pressure

Posted by billy on Monday, September 13, 2010 at 10:47pm.

the vapor pressure of pure water at 25C is 23.8 torr. determine the vapor pressure (torr) of water at 25 C above a solution prepared by dissolving 35g of urea (a nonvolatile, non-electrolyte, MW = 60.0G/MOL) IN 76G of water.
answer:21

i just want to know the steps bc im confused... help?

chemistry - vapor pressure - DrBob222, Monday, September 13, 2010 at 11:06pm
Step 1. Determine mole fraction water.
a. moles urea = grams/molar mass = 35/60 = 0.583
b. moles H2O = 76/18 = 4.222
c. total moles = 4.805
d. X_H2O = 4.222/4.805 = ??

Step 2.
P_soln = X_solvent*P^o_solvent
where P^o = normal vapor pressure of the solvent.
chemistry - vapor pressure - Anonymous, Tuesday, January 11, 2011 at 6:40am
lwjbjsovkpkgphjighbbbbbfwigaglgqapökpegjkopsjhwogjhropprshkpslbpgs
chemistry - vapor pressure - Anonymous, Tuesday, January 11, 2011 at 6:40am
lwjbjsovkpkgphjighbbbbbfwigaglgqapökpegjkopsjhwogjhropprshkpslbpgs
chemistry - vapor pressure - Anonymous, Tuesday, January 11, 2011 at 6:40am
lwjbjsovkpkgphjighbbbbbfwigaglgqapökpegjkopsjhwogjhropprshkpslbpgs

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