Question

Find ∆H for the reactions given below using Hess's Law. Show your work on a separate
sheet of paper.

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

a. 2Al(s) + 3/20₂(g) → Al₂O3(s); ∆H = -1675.7 kJ

b. 2Fe(s) + 3/20₂(g) →Fe₂O3(s); AH = -824.2 kJ