Answer to Question #82010 in General Chemistry for Manvir Nahal

Question

What is the ΔH° for the following reaction (in kJ/mol of reaction exactly as written)?

2 Al (s) + Fe2O3 (s) → Al2O3 (s) + 2 Fe (s)

To solve, use Appendix II in your textbook (containing standard heats of formation).

Answer 1

To solve, use Appendix II in your textbook (containing standard heats of formation)

ΔH°- ?

ΔHf(Fe) = 0

ΔH (Al) = 0

ΔHf (Fe2O3) = -822.2 kJ/mol

ΔHf (Al2O3) = -1676 kJ/mol

ΔH° = n ΔHf (prod.) – m ΔHf (reag.)

ΔH° = -1676 – (-822.2) = -853.8 kJ/mol