Sulfate (SO₄²⁻) is a polyatomic ion, not an element, so it doesn't have an atomic mass. Instead, it has a molar mass, which is the mass of one mole of the ion.

Here's how to calculate the molar mass of sulfate:

* Sulfur (S): 32.06 g/mol

* Oxygen (O): 16.00 g/mol (x 4 atoms) = 64.00 g/mol

Total molar mass of sulfate (SO₄²⁻) = 32.06 g/mol + 64.00 g/mol = 96.06 g/mol