Chemistry Practice Problems Bond Energy Practice Problems Solution: Compare the value you obtain using average bond en...

Solution: Compare the value you obtain using average bond energies to the actual standard enthalpy of formation of gaseous benzene, 82.9 kJ/mol. What does the difference between these two values tell you about the stability of benzene?

Problem

Compare the value you obtain using average bond energies to the actual standard enthalpy of formation of gaseous benzene, 82.9 kJ/mol. What does the difference between these two values tell you about the stability of benzene?

Solution

We have to compare the actual enthalpy of formation of gaseous benzene with the enthalpy of formation calculated from average bond energies.


The change in enthalpy when one mole of a substance is formed from its reactants in their standard states, is called standard enthalpy of formation (Δf).


Standard enthalpy of reaction can be calculated using the bond energies:

H°rxn = ΣBEreactants - ΣBEproducts

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