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The chemical reaction that causes chromium to corrode in air is given by: 4Cr + 3O2 → 2Cr2O3 In which 298 K ΔH°rxn = -2256 kJ ΔS°rxn = -549.1 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.