Homework Help: Chemistry 2

Posted by Jesse on Thursday, January 27, 2011 at 9:42pm.

An aqueous solution has a vapor pressure of 81.1 at 50 . The vapor pressure of pure water at this temperature is 92.6. What is the concentration of in mass percent?

Chemistry 2 - DrBob222, Thursday, January 27, 2011 at 9:50pm
What is the concn of WHAT? in mass percent?
Psoln = Xsolvent*Psolvent
81.1 = Xsolvent*(92.6)
Solve for X which is the mole fraction of the solvent,
1-mole fraction solvent = mole fraction solute.
Convert mole fraction solute to mass percent.

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