The thermite reaction involves aluminum and iron(III) oxide:
2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(l)
This reaction is highly exothermic, and the liquid iron formed is used to weld metals. Calculate the heat released in kilojoules per gram of Al reacted with Fe2O3.
(The ΔH°f for Fe(l) is 12.40 kJ/mol; ΔH°f for Fe2O3(s) is -822.2 kJ/mol;
ΔH°f for Al2O3(s) is -1669.8 kJ/mol)