(aq) \rightarrow \mathbf{4}Al\, (s) + \mathbf{3}O_{2}\, (g)\) The equation shows you that for every two moles of aluminium oxide oxidised, four moles of aluminium metal are obtained along with ...

The co-efficients in balanced equations represent the number of moles reacting and being produced, it is rare that this exact ratio will be used in a reaction. For example, some reactants can be ...