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The chemical reaction that causes iron to corrode n air is given by 4Fe + 3O2 → 2Fe2O3 in which at 298 K ΔH°rxn = -1684 kJ ΔS°rxn = -543.7 J/K What is the Gibbs free energy for this reaction at 3652 K? Assume that ΔH and ΔS do not change with temperature. Express your answer to two decimal places and include the appropriate units.