Metallurgical Engineering > GATE 2025 > Ellingham Diagram
Consider the following reactions and their standard Gibbs free energies (in J):
Fe(s)+1/2 O2(g)↔FeO(s); ΔG°=-264900+65T
2 H2(g)+O2(g)↔2 H2O(g); ΔG°=-492900+109T
Assuming Fe and FeO to be pure and no solubility of gases in the solids, the value of pH2O/pH2 required to reduce solid FeO to solid Fe at 1000 K is ______ (rounded off to two decimal places).
Given: Ideal gas constant R=8.314 J mol-1K-1
Fe(s)+1/2 O2(g)↔FeO(s); ΔG°=-264900+65T
2 H2(g)+O2(g)↔2 H2O(g); ΔG°=-492900+109T
Assuming Fe and FeO to be pure and no solubility of gases in the solids, the value of pH2O/pH2 required to reduce solid FeO to solid Fe at 1000 K is ______ (rounded off to two decimal places).
Given: Ideal gas constant R=8.314 J mol-1K-1
Correct : 1.48
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