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The enthalpy change for the reaction is ...

The enthalpy change for the reaction is `1650 kJ`.
`2 Fe_2 O_3(s) rarr 4 Fe(s)+3 O_2(g)`
What is the enthalpy of formation of `Fe_2 O_3(s)` .

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Delta_r H^circ=2 xx 824=1648 kJ.
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