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The chemical reaction that causes aluminum to corrode in air is given by 4Aln + 3O2 → 2Al2O3 in which at 298 K ΔH°rxn = -3352 kJ ΔS°rxn = - 625.1 J/K What is the standard Gibbs free energy for this reaction? Assume the commonly used standard reference temperature of 298 K. Express your answer as an integer and include the appropriate units.