Iron iii sulfide reacts with carbon monixide according to, Ask an Expert

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Iron (III) sulfide reacts with carbon monixide according to the following equation: Fe2O3 + 3CO yields 2Fe + 3CO2. A reaction mixture initially contains 22.55g Fe2O3 and 14.78g CO. Once the reaction has occurred as completely as possible, what mass (in g) of the excess reactant is left?

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