16. The standard enthalpy of formation of Al2O3 at 298 K is -1675 kJ mol. Calculate the standard enthalpy of formation of Al2O3 at 800 K if the molar heat capacities are given: ΔCp(Al) = 20.67 12.39*10^-3 T, ΔCp(O2) = 31.46 3.39*10^-3 T - 3.77*10^5 T^-2, ΔCp(Al2O3) = 114.56 12.89*10^-3 T - 34.31*10^5 T^-2,

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