Calculate the standard change in Gibbs free energy for the following reaction at

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I think you have made a mistake in typing the equation. The equation should be: 2Al + Fe2O3 ----> Al2O3 + 2Fe {The aluminothermic process for extraction of iron} According to Hess' law, the chemical equations can be added or subtracted as if they were algebraic equations. We need to express the above equation in the form of the 2 equations the data of which is provided. Reversing the second equation, we have Fe2O3 ----> 2Fe + 3/2 O2 {?H = +824.2 kJ} Adding this to the first equation, we have 2Al + Fe2O3 +3/2 O2 ----> 2Fe + 3/2 O2 + Al2O3 Cancelling the commom O2, 2Al + Fe2O3 ----> 2Fe + Al2O3. ?H(reaction) = -1669.8+824.2 =-845.6 kJ Source(s):

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