A considerable amount of heat is required for the decomposition of aluminum oxide. 2 al2o3 (s) â 4 al (s) + 3 o2 (g) Î'h = 3352 kj (a) what is the heat change for the formation of 1 mol of aluminum oxide from its elements?

To determine the heat change during a reaction, we need to know the heat of reaction of the process. For this case, the heat of formation is needed since it is a formation reaction. It will have units of kJ per mole. We determine the heat change as follows:

Heat change = 3352 kJ / 2 mol Al2O3 (1 mol Al2O3) = 1676 kJ