posted by Sam .
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?
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*PoH2O
pEtOH = XEtOH*PoEtOH</sb>
Ptotal = pEtOH + pH2O