Given the following:

2 Fe(s)  +  3/2 O2(g)  →  Fe2O3(s)  ΔHorxn = -824.2 kJ/mol

3 Fe(s)  +  2 O2(g)  →  Fe3O4(s)  ΔHorxn = -1118.4 kJ/mol

Calculate the ΔHorxn for the following equation:

3 Fe2O3(s)  →  2 Fe3O4(s)  +  1/2 O2(g)

Your answer should be to one place past the decimal point.

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Chemical Thermodynamics

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