Answer to Question #344860 in General Chemistry for Ne Ne

Question

Calculate the mole fraction of solute in the aqueous solution of 13% C₂H₅OH.

Answer 1

The easiest way in case of percent is to start with a mass of 100 gram solution. This solution contains 13 g ethanol and 87 g water.

13 g ethanol = 13/ 46 = 0.28 moles ethanol

87 g water = 87 / 18 = 4.83 moles water

the mole fraction = 0.28 / (0.28 + 4.83) = 0.05