The density of acetonitrile (CH3CN)is 0.786 g/mL, and the density of methanol (CH3OH)is 0.791 g/mL. A solution is made by dissolving 24.5mL (CH3OH)in 98.9mL (CH3CN). What is the mole fraction of methanol in the solution?

Answer 1

Use density to convert mL methanol and acetonitrile to grams.
Convert grams of each to mols.
mole fraction methanol= mols methanol/total mols.
mole fraction acetonitrile = mols acetonitrile/total mols.