If ΔG=−177 k cal for(1) 2Fe(s)+32O2(g)→Fe2O3(s)and ΔG=−19 k ca – InterviewSolution

1.	If ΔG=−177 k cal for(1) 2Fe(s)+32O2(g)→Fe2O3(s)and ΔG=−19 k cal for(2) 4Fe2O3(s)+Fe(s)→3Fe3O4(s)What is the Gibbs free energy of formation of Fe3O4(s) ?
Answer» If $Δ G = - 177 k cal$ for (1) $2 F e (s) + \frac{3}{2} O_{2} (g) \to F e_{2} O_{3} (s)$ and $Δ G = - 19 k cal$ for (2) $4 F e_{2} O_{3} (s) + F e (s) \to 3 F e_{3} O_{4} (s)$ What is the Gibbs free energy of formation of $F e_{3} O_{4} (s)$ ?

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