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Question

# Determine the heat of the following reaction: FeO(s)+Fe2O3(s)→Fe3O4(s) Given informations: 2Fe(s)+O2(g)→2FeO(s); ΔH∘=−544 kJ4Fe(s)+3O2(g)→2Fe2O3(s); ΔH∘=−1648.4 kJFe3O4(s)→3Fe(s)+2O2(g);ΔH∘=+1118.4 kJ

A
1074 kJ
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B
22.2 kJ
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C
+249.8 kJ
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D
+2214.6 kJ
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Solution

## The correct option is B −22.2 kJ2FeO(s)→2Fe(s)+O2(g);ΔH∘=+544kJ2Fe2O3(s)→4Fe(s)+3O2(g);ΔH∘=+1648.4kJ 6Fe(s)+4O2(g)→2Fe3O4(s); ΔH∘=−2×1118.4kJ–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– On adding. 2FeO(s)+2Fe2O3(s)→2Fe3O4(s); ΔH∘=−44.4 kJ–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––∴FeO(s)+Fe2O3(s)→Fe3O4(s); ΔH∘=−22.2 kJ

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