Homework Help: Chemistry

Posted by Angelica on Monday, February 15, 2010 at 4:19pm.

Benzene has a vapor pressure of 100.0 Torr at 26°C. A nonvolatile, nonelectrolyte compound was added to 0.309 mol benzene at 26°C and the vapor pressure of the benzene in the solution decreased to 60.0 Torr. What amount (in moles) of solute molecules were added to the benzene?

Chemistry - DrBob222, Monday, February 15, 2010 at 6:01pm
Isn't delta P = X_soluteP^o_solvent
Chemistry - Angelica, Monday, February 15, 2010 at 7:21pm
That is what I tried using...I solved for m for when P= 100 Torr, then used that to set up an equation when P=60 Torr to find the difference, but my answer is consistently incorrect. I am setting up the algebra incorrectly but am not sure what I am missing
Chemistry - DrBob222, Monday, February 15, 2010 at 9:26pm
This is not a molality problem. I think I've taken care of this problem further up the board.

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