In a blast furnace, iron (III) oxide is used to produce iron by the following (unbalanced) reaction: Fe2O3 (s) + CO(g)  ->  Fe(s) + CO2(g) If 4000 g of Fe2O3 is available to react, how many moles of CO are needed?

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".