Sodium bromide, used to produce silver bromide for use in ph…

Sodium bromide, used to produce silver bromide for use in photography, can be prepared as shown: Fe + Br2 → FeBr2 FeBr2 + Br2 → Fe3Br8 (unbalanced) Fe3Br8 + Na2CO3 → NaBr + CO2 + Fe3O4 (unbalanced) How many moles of iron are required to produce 16 moles of sodium bromide?