The weight fraction of chlorobenzene is 0.01138.
The concentration of C₆H₅Cl is 100 mol/m³
Moles of C₆H₅Cl/ volume of solution = 100 mol/m³
Moles of C₆H₅Cl= 100 mol
Mass of C₆H₅Cl = moles × molecular weight
= 100 mol × 112.56 g/mol = 11256 g × 1 kg / 1000 g = 11.256 kg
Mass of solution = density × volume = 1 × 1000 = 1000 Kg
Mass of solvent = Mass of solution - Mass of C₆H₅Cl
= 1000 - 11.256 = 988.744 Kg
Now, the weight fraction of chlorobenzene = Mass of C₆H₅Cl / Mass of solvent
= 112.56 / 988.744 = 0.01138