Give the formula for each coordination compound. Include square brackets around the coordination complex. Do not include the oxidation state on the metal. Use parentheses only around polyatomic ligands. For ethylenediamine use (en) in the formula.
a. sodium tetrachloroplantinate(II)
b. dibromobis(ethylenediamine)cobalt(III) bromide
c. tetraamminediaquairon(III) chloride