Fe$_2$O$_{3(s)}$ + 2Al$_{(s)}$ → Al$_2$O$_3$ + 2Fe$_{(s)}$. If the heats of formation of Al$_2$O$_3$ and Fe$_2$O$_3$ are - 1670 kJmol$^{-1}$ and - 822 kJmol$^{-1}$ respectively, the enthalpy change in kJ for the reaction is ?

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