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The following two reactions are known: Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g); ΔH = −26.8 kJ FeO(s) + CO(g) → Fe(s) + CO2(g); ΔH = −16.5 kJ The value of ΔH for the following reaction Fe2O3(s) + CO(g) → 2FeO(s) + CO2(g) is:

1. +6.2 kJ
2. +10.3 kJ
3. −43.3 kJ
4. −10.3 kJ

Correct answer: +10.3 kJ

Solution

To find ΔH for the given reaction, subtract the second reaction from the first. This gives ΔH = (−26.8) − (−16.5) = −26.8 + 16.5 = −10.3 kJ. Thus, the correct answer is +10.3 kJ.

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