For the reduction of FeO at the temperature corresponding to point D, which of the following statements is correct?
The curve for oxidation of Fe to FeO and CO to CO2 meet at point D and have the same ΔG value.
2Fe+ O2→ 2FeO ---ΔG1
2CO + O2 → 2CO2 --- ΔG2
ΔG1 = ΔG2 because the curves meet at point D.
For reduction of FeO to Fe the sign of ΔG1 must be changed. It becomes - ΔG1. Now the overall ΔGr= - ΔG1 + ΔG2 =0
1