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Calculate DeltaH^@ for 2Al+Fe2O3rarr2Fe+...

Calculate `DeltaH^@` for `2Al+Fe_2O_3rarr2Fe+Al_2O_3` given that standard heat enthalpy of `Fe_2O_3` and `Al_2O_3` are -196.5 and `-399.1 kcal mol^-1`

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-202.6 kcal
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