The balanced equation for the decomposition of aluminium tetraoxosulphate (also known as aluminium sulfate) is:
2Al2(SO4)3(s) → 2Al2O3(s) + 3SO2(g) + 3O2(g)
This equation shows that when solid aluminium tetraoxosulphate is heated, it decomposes into solid aluminium oxide, and gases sulphur dioxide and oxygen. The coefficients in the balanced equation indicate that two molecules of aluminium tetraoxosulphate decompose to form two molecules of aluminium oxide, three molecules of sulphur dioxide, and three molecules of oxygen.