See explanation below.
Work Step by Step
a. The coordination number of metal ion that is cobalt, is 6.As 6 ligands are connected to cobalt. b.The chloride ion is the counter ion to cobalt, and each chloride has -1 charge.cobalt has +3charge and en has 0 charge, which makes up the + charge of the ion. c.When one mole of complex dissolves in water, it yields 2 individual ions. d.When one mole of complex dissolves, it gives one mole of Cl- ions which reacts with Ag+ and forms AgCl precipitate