Answer: 3 Moles
Explanation: The reaction suggests that 1 mol of Fe₂O₃ reacts with 3 moles of CO and forms 2 moles of Fe and 3 moles of CO₂. If 1 mol of Fe₂O₃ reacts with 3 moles of CO. Hence, 5.25 mol of CO reacts with 1.75 moles of Fe₂O₃.
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