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2 Fe( s ) + 3 / 2 O 2 ( g ) Fe 2 O 3 ( s ) H = -823 kJ 3

2 Fe(s) + ³/₂ O₂(g) Fe₂O₃(s)	H = -823 kJ
3 Fe(s) + 2 O₂(g) Fe₃O₄(s)	H = -1120. kJ

Calculate the H for the following reaction.

3 Fe₂O₃(s) 2 Fe₃O₄(s) + O₂(g)

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