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.