Compound ΔHf, (kJ/mol) Al2O3(s) − 1675.7 CO(g) −110.5 Al(s) 0 CO2(g) −393.5 Use standard enthalpies of formation in the table above to determine ΔHrxno for the reaction: Al2O3(s)+3CO(g)→2Al(s)+3CO2(g)

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