Here's how to determine the chemical formula for cobalt(III) sulfate:

* Cobalt(III): This indicates that cobalt has a +3 charge (Co³⁺).

* Sulfate: The sulfate ion has a -2 charge (SO₄²⁻).

To balance the charges, we need two cobalt(III) ions (2 x +3 = +6) and three sulfate ions (3 x -2 = -6). This gives us:

Co₂(SO₄)₃

This is the chemical formula for cobalt(III) sulfate.