Problem: The following is known as the thermite reaction: 2 Al(s) + Fe2O3(s) → Al2O3 (s) + 2 Fe(s)This highly exothermic reaction is used for welding massive units, such as propellers for large ships. Using enthalpies of formation in Appendix C, calculate ΔH˚ for this reaction.

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We are asked to calculate the value of ΔH˚ for 2 Al(s) + Fe2O3(s) → Al2O3 (s) + 2 Fe(s)



ΔH°rxn=ΔH°f, product-ΔH°f,reactant


Note that we need to multiply each ΔH˚ by the stoichiometric coefficient since ΔH˚ is in kJ/mol. 


Balanced reaction : 2 Al(s) + Fe2O3(s) → Al2O3 (s) + 2 Fe(s)


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Problem Details

The following is known as the thermite reaction: 2 Al(s) + Fe2O3(s) → Al2O3 (s) + 2 Fe(s)

This highly exothermic reaction is used for welding massive units, such as propellers for large ships. Using enthalpies of formation in Appendix C, calculate ΔH˚ for this reaction.

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Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.