8.77 Bond Enthalpy (Benzene)

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Kathleen Vidanes 1E
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Joined: Fri Sep 29, 2017 7:07 am

8.77 Bond Enthalpy (Benzene)

Postby Kathleen Vidanes 1E » Tue Jan 23, 2018 8:48 pm

On homework question 8.77, why is it that the 6 C--H bonds within benzene are not added to the 3 C double bonds and the 3 C single bonds?

Vivian Nguyen
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Re: 8.77 Bond Enthalpy (Benzene)

Postby Vivian Nguyen » Tue Jan 23, 2018 8:54 pm

The 6 C-H resonance stabilized bonds are not added because the question asks for the difference in the stability/molar energy depending on the types of bonds are considered. As a result the 6 C-H resonance bonds are one calculation while the 3 C double bonds and 3 C single bonds are the calculation in the comparison.

Ryan Fang 1D
Posts: 53
Joined: Sat Jul 22, 2017 3:00 am

Re: 8.77 Bond Enthalpy (Benzene)

Postby Ryan Fang 1D » Tue Jan 23, 2018 9:40 pm

While you can add the 6 C-H bonds into both calculations, because you are finding the difference between your two calculations, adding the C-H bonds to both won't make a difference.

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