Homework Help: chem

Posted by niki on Tuesday, June 7, 2011 at 6:28am.

at 40 degree C , the vapour pressure of water is 55.3 mm of hg. calculate the vapour pressure at same temp. of 10%aques solution of urea??

chem - DrBob222, Tuesday, June 7, 2011 at 2:01pm
P_H2O = X_soln*P^o_H2O
10% urea = 10g urea/(10g urea+90g H2O)
moles urea = grams/molar mass urea.
moles H2O = grams/molar mass H2O.
X_H2O = moles H2O/total moles.
Then plug this X for H2O into the equation at the top, multiply by 55.3 mm.
typo - DrBob222, Tuesday, June 7, 2011 at 2:02pm
The first equation should read this way.
Psoln = XH2O*PoH2O

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