I'm not sure how to calculate the ΔH°rxn

for 3 Al + 3 NH4ClO4 -> Al2O3 + AlCl3 + 3 NO + 6 H2O. I'm honestly not sure where to start with this problem.

1 answer

Look up the delta Ho formation of each. (Al is zero but the others have numbers for each.)
Then dHrxn = (n*dHformation products) - (n*dH formation reactants_
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