To calculate the ΔH°rxn using bond energies, we’re going to use the following equation:
Balanced Reaction: 2 H3C−CH3 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g)
*always make sure that the given reaction is balanced
Draw the structure of each compound.
Ethane, a minority component of natural gas, burns to form carbon dioxide and water according to this reaction:
2 H3C−CH3(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(g)
Note that the average bond energy for the breaking of a bond in CO2 is 799 kJ/mol. Use average bond energies to calculate ΔHrxn for this reaction.
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Our data indicates that this problem or a close variation was asked in Principles of Chemistry: A Molecular Approach - Tro 4th Edition. You can also practice Principles of Chemistry: A Molecular Approach - Tro 4th Edition practice problems.