Question

Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachioride.

Answer 1

30% of benzene in carbon tetrachloride by mass means that Mass of benzene in the solution = 30g 

Mass of solution = 100 g 

Mass of carbon tetrachloride = 100g – 30g = 70g 

Molar mass of benzene (C₆H₆) = 78 g mol^-1

Molar mass of CCl₄ = 12 + (4 x 35.5) = 154 g mol^-1