You're asking for the formula of gold(III) sulfate. Here's how to write it:

* Gold(III) indicates the gold ion has a +3 charge (Au³⁺).

* Sulfate is the polyatomic ion SO₄²⁻.

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

Au₂(SO₄)₃