What is the stoichiometric ratio of the following: 4FeS + 7O2 → 2Fe2O3 + 4SO2 Select the correct answer below: 4 moles + 2 moles → 2 moles +2 moles 4 moles + 7 moles → 2 moles + 4 moles 4 moles + 7 moles → 1 mole + 4 moles 4 moles + 7 moles → 3 moles + 4 moles