Question

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

Answer 1

Mass of benzene = 30

molar mass of benzene = 78

moles of benzene = 30/78

 = 0.38

mass of carbon tetrachloride = 70

molar mass of carbon tetrachloride = 154

moles of carbon tetrachloride = 70/154

 = 0.45

total number of moles = 0.38 + 0.45 = 0.83

mole fraction of benzene = 0.38 / 0.83

 = 0.45