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Question

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) ?

A
+229.6 kcal/mol
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B
242.3 kcal/mol
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C
727 kcal/mol
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D
229.6 kcal/mol
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