Final answer:
Without the balanced chemical equation for the reaction involving CuFeS₂, the mole ratio required to determine the moles of O₂ needed for 12 moles of CuFeS₂ cannot be found.
Step-by-step explanation:
To answer the question about how many moles of O₂ are required if 12 moles of CuFeS₂ are consumed, we need the balanced chemical equation for the reaction that CuFeS₂ is involved in. Unfortunately, the student's question does not provide this equation, so we can't determine the correct mole ratio and hence can't provide an answer to the question. In general, to solve a problem like this, you would balance the overall chemical equation for the reaction and use the stoichiometric coefficients to find the molar ratios between reactants and products. This ratio will tell you how many moles of one substance are needed for a certain number of moles of another substance.