* Gold(III) indicates that gold has a +3 charge (Au³⁺).
* Sulfate is a polyatomic ion with the formula SO₄²⁻.
* To balance the charges, we need two gold ions (2 x +3 = +6) and three sulfate ions (3 x -2 = -6).
Therefore, the formula is Au₂(SO₄)₃.