To calculate the ΔH°rxn using bond energies, we’re going to use the following equation:
Let’s first figure out what kind of bonds and how many moles are present in each reactants and products because the given bond energies are per mole.
Balanced Reaction: 2 H2S(g) + 3 O2(g) → 2 SO2(g) + 2 H2O(g)
*always make sure that the given reaction is balanced
Draw the structure of each compound.
2 H2S(g) + 3 O2(g) --> 2 SO2(g) + 2 H2O(g)
Calculate the ∆Hrxn in kJ.
Average bond energies:
H—S 347 kJ/mol
O = O 495 kJ/mol
O—H 463 kJ/mol
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