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Based on the balanced equation, the mole ratio of Iron to Sulphur is 8 to 1.
This means that for every mole of sulfur, 8 moles of iron is needed for the reaction.
∴ since the moles of Sulfur = 8.49 moles
⇒ moles of Iron = 8.49 moles × 8
= 67.92 moles