2 Fe2O3(s) + 3 C(s) ? 4 Fe(s) + 3 CO2(g) In a blast furnace, the reaction represented above occurs, producing Fe(s) from its ore, Fe2O3(s). The reaction is thermodynamically favorable and based on coupling the two reactions represented below. 2 Fe2O3 ? 4 Fe + 3 O2 C + O2 ? CO2 Which of the following identifies a limitation in how the representations above describe a system of coupled reactions? A None of the equations are balanced. B The values of ?S° for each reaction are not shown. C The values of ?G° for each reaction are not shown. D The coupled reactions lack a common intermediate species.
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