a solution is made by mixing 38.0 ml of ethanol C2H6O, 62.0mL of water. assuming ideal behavior, what is the vapor pressure of the solution at 20 C

Answer 1

mols C2H5OH = grams/molar mass. Use density to convert mL to grams.
mols H2O = grams/molar mass. Use density to convert mL to grams.
Then XC2H5OH = nC2H5OH/total mols
XH2O = nH2O/total mols

pH2O = XH2O x P^o_{H2O,/sub>
pC2H5OH = XC2H5OH x P^oC2H5OH
Ptotal = pC2H5OH + pH2O}