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How many reactant species (molecules/formula units/atoms) will react in the reaction represented by the equation below? Assuming that it's a 100% yield. 2 Co2O3(s) + 3 C(s) → 4 Co(s) + 3 CO2(g) [Balanced Equation] Would it be 5, 7, or 12 moles? I'm not sure how to approach this problem exactly.