Q.

If the heats of formation of Al2O3 and Fe2O3 are -400 K.Cal and -190 K.Cal respectively, the heat of the following reaction is 2Al + Fe2O3 →2Fe + Al2O3

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answer is 4.

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If the heats of formation of Al2O3 and Fe2O3 are -400 K.Cal and -190 K.Cal respectively, the heat of the following reaction is 2Al + Fe2O3 →2Fe + Al2O3