1 L, 0.02M solution of [Co(NH$$_3$$)$$_5$$ SO$$_4$$]Br is mixed with 1 L, 0.02M solution of [Co(NH$$_3$$)$$_5$$Br]SO$$_4$$. The resulting solution is divided into two equal parts (X) and treated with excess AgNO$$_3$$ solution and BaCl$$_2$$ solution respectively as shown below:
1 L Solution (X) + AgNO$$_3$$ solution (excess) $$\to$$ Y
1 L Solution (X) + BaCl$$_2$$ solution (excess) $$\to$$ Z
The number of moles of Y and Z respectively are