Chemistry - Mole Concept Question with Solution | TestHub

5 g sample of ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$ was dissolved in water. ${\mathrm{BaCl}}_2$ solution was mixed in excess to this solution. The precipitate $\left({\mathrm{BaSO}}_4\right)$ obtained was washed and dried, it weighted 4.66 g . What is the % of ${\mathrm{SO}}_4{}^{2-}$ by weight in the sample. [ ${\mathrm{M}}_{\mathrm{wt}}$ of $\mathrm{Ba},\mathrm{S},\mathrm{O},\mathrm{Cu}$ respectively are $137,32,16\&63.5\mathrm{gm}/\mathrm{mol}$ ]