1   L , 0 . 02 M solution of Co NH 3 5 SO 4 Br is mixed with 1   L , 0 . 02 M solution of Co NH 3…

The number of moles of  $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{SO}}_4\right]\mathrm{Br}=0.02\times 1=0.02 \mathrm{mol}$ 

The number of moles of   $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Br}\right]{\mathrm{SO}}_4=0.02\times 1=0.02 \mathrm{mol}$

The total volume of the solution becomes two Litres after mixing.

Following precipitation reactions occur:
$\begin{array}{ccccc}\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{SO}}_4\right]\mathrm{Br}& +& {\mathrm{AgNO}}_3& \to & \mathrm{AgBr}\downarrow \\ 0.01\mathrm{mol}& & \mathrm{excess}& & 0.01 \mathrm{mol}\end{array}$

$\begin{array}{ccccc}\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Br}\right]{\mathrm{SO}}_4& +& {\mathrm{BaCl}}_2& \to & {\mathrm{BaSO}}_4\downarrow \\ 0.01\mathrm{mol}& & \mathrm{excess}& & 0.01 \mathrm{mol}\end{array}$