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In the following overall chemical reaction, aluminum displaces chromium from chromium(III) oxide and forms aluminum oxide. 2 Al(s) + Cr2O3(s) -> 2 Cr(s) + Al2O3(s); ΔH = ? Find the change in enthalpy for this reaction, using Hess' law and the enthalpy changes for the reactions given below. (1a) 4 Al(s) + 3 O2(g) -> 2 Al2O3(s); ΔH = -3351.4 kJ (2a) 4 Cr(s) + 3 O2(g) -> 2 Cr2O3(s); ΔH = -2279.4 kJ