Answer
MF of isopropyl = .358
MF of water = .642
Work Step by Step
Convert 65 g of isopropyl alcohol to moles by dividing by molar mass of isopropyl
Convert 35 g of water to moles by dividing by molar mass of water
Mole Fraction = moles of component/total moles
MF of isopropyl = moles of isopropyl / (moles of isopropyl + moles of water)
MF of water = moles of water/ (moles of isopropyl + moles of water)