A solution is prepared by dissolving 2 moles of a non-volatile solute in 4 moles of a volatile solvent. If the vapor pressure of the pure solvent is 24 torr, what will be the vapor pressure of the solution?

Question

aaronq · Answer

you use:  $P_{solution}=\chi_{solute}*P_{solvent}^o$

anonymous · Answer

i keep getting 8, but the answer is 16 

(2 moles/6 moles) * 24 torr=8?

aaronq · Answer

sorry if forgot to include the delta sign it should be $\Delta P_{solution}=...$

So to find the actual pressure you take the initial minus the change:

$ P_{solution}=P^o_{solvent}-\Delta P_{solution}$

anonymous · Answer

o ok i got it