Write the formula for each of the following coordination compounds.

(a) CoCl₃·5NH₃, in which only one of the chloride ions is coordinated to the metal

(b) CoCl₃·4NH₃, in which two chloride ions are coordinated to the metal

(c) The potassium salt of a complex containing chromium(III) coordinated to five CN^- ions and one CO molecule (note that the CO ligand is a neutral molecule, carbon monoxide)

Strategy Determine which ligands are coordinated to the metal and which are counterions.

Place the coordinated ligands and the metal in square brackets.