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3Fe2O3 + CO -> 2Fe3O4 +CO2 ^H= -48,5
6FeO + 6CO -> 12Fe + 6CO2 ^H= +66
2Fe3O4 +2CO -> 6FeO + 2CO2 ^H= +44
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3Fe2O3 + 9CO -> 12Fe + 9CO2 ^H=+61,5
yg ditanyakan adalah
Fe2O3 + CO -> 2Fe + 3CO2
maka sederhanakan ^H tersebut
^H = +61,5 / 3 = +20,5 KJ
Fe2O3 + 1/3 CO --> 2/3 Fe3O4 + 1/3 CO2. ΔH = -16,167kj
2FeO + 2CO --> 2Fe + 2CO2 ΔH= 22kj
2/3 Fe3O4 + 2/3 CO --> 2FeO + 2/3 CO2. ΔH= 14,667kj
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Fe2O3 + 3 CO --> 2Fe + 3CO2. ΔH= 20,5kj