## 8.77

$\Delta U=q+w$

KarenaKaing_1D
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

### 8.77

What is benzene? And what are the Kekule structures?

DEVIKA CHANDRAMOHAN 1I
Posts: 12
Joined: Fri Sep 25, 2015 3:00 am

### Re: 8.77

Benzene is the organic compound with the chemical formula C6H6. The Kekule structure (the model for benzene suggested by Kekule) is drawn as 6 carbons in a ring (3 double bonds, 3 single bonds, alternating) with 1 hydrogen coming off of each one. This results in the bond enthalpy of the carbons being 3(348 kJ for C=C) + 3(612 kJ for C-C). If we allow for resonance, looking at table 8.7, we see the bond enthalpy for the carbons is 6(518 kJ C--C).

I hope that helps!