Homework Help: chemistry

Posted by renee on Wednesday, February 22, 2012 at 4:09pm.

A solution is made by adding 0.100 mole of ethyl ether to 0.841 mole of ethyl alcohol. If the vapor pressure of ethyl ether and ethyl alcohol at 20oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20oC (assuming ideal behavior) is:
Answer

chemistry - DrBob222, Wednesday, February 22, 2012 at 9:36pm
total moles = mol ether + mol EtOH
Xether = moles ether/total mols
XEtOH = moles EtOH/total moles

pether = Xether*Po ether
pEtOH = XEtOH*Po EtOH
Total vapor pressure above the solution = pether + pEtOH.

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