492. FeO (s) + CO (g) = Fe (s) + CO₂ (g), k = 0. 435 at 1173E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K? September 6, 2025 by Admin A. 1.0 B. 1.3 C. 2.3 D. 3.3 ✅ The correct answer is option D.