The roasting of Iron pyrites () converts it to Ferric oxide () and Sulphur dioxide (). When this che — Metallurgy and Isolation of Elements Chemistry Question

Question

The roasting of Iron pyrites ($FeS_2$) converts it to Ferric oxide ($Fe_2O_3$) and Sulphur dioxide ($SO_2$). When this chemical equation is balanced with the lowest possible whole-number coefficients, what is the stoichiometric coefficient of the oxygen gas ($O_2$) reactant?