Answer:Explanation:Hello!The chemical compound that is given to us explains important things;-for starters,the numbers after cobalt show the charge on the cobalt as they could have multiple charges or impossible to infer based on periodic table trends-Knowing that, we know that the charge of cobalt is 3.-Looking at the periodic table, we know the charge of oxygen is -2-the balanced formula has to equal out in negative and positive charges, which means we should have two cobalts and 3 oxygens to cancel out the positive 6 charge on cobalt and -6 charge on oxygen to make 0 overall charge...

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