But normality = molarity x valency factory (v.f.) so, in that way millimoles of BaCl2 will be 20 x 0.5 x 2 = 20 mL and that of H2SO4 will be 20 x 1 x 2 = 40 mL so in that way, millimoles of BaSO4 formed would be 20/1000 = 0.02 moles. Plz correct this.