Exactly $550\mathrm{.}0mL$ of a solution that contained $449\mathrm{.}8ppm$ of $Ba(N{O}_3{)}_2$ were mixed with $260\mathrm{.}0mL$ of a solution that was $0\mathrm{.}03080M$ in $A{l}_2(S{O}_4{)}_3.$

a$.$ What mass of solid $BaS{O}_4$ was formed?

Mass $=\_\_\_\_\_\_\_\_\_\_$g

b$.$ What was the molar concentration of the unreacted reagent $[$Al$2($SO$4)3$ or Ba$($NO$3)2?]$

Molar concentration $=\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

Unreacted reagent is $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$