Problem: 2 H2S(g) + 3 O2(g) --> 2 SO2(g) + 2 H2O(g)Calculate the ∆Hrxn in kJ.Average bond energies:H—S 347 kJ/molO = O 495 kJ/molO—H 463 kJ/mol

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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.

Reactants:

 H2S:

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Problem Details

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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