Question

Calculate the standard enthalpy change for the reaction
2Al(s) + Fe₂O3(s) → 2Fe(s) + Al₂O3(s)
given that
2Al(s) + ¾O₂(g) → Al₂O3(s)
AH
= -1669.8 kJ/mol
2Fe(s) + O₂(g) → Fe₂O3(s)
AHxn
= -822.2 kJ/mol