Homework Help: Chemistry II

Posted by Sam on Tuesday, July 17, 2012 at 8:47pm.

A solution is made by mixing 38.0 mL of ethanol, C2H6O, and 62.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?

Chemistry II - DrBob222, Tuesday, July 17, 2012 at 9:48pm
You will need density to convert to grams, then convert to mols ethanol and mol H2O.
mol fraction EtOH = XEtOH = nEtOH/total mols
XH2O = nH2O/total mols.

Then pH2O = XH2O*P^o_H2O
pEtOH = XEtOH*P^o_{EtOH</sb>

Ptotal = pEtOH + pH2O}

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