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Bond Enthalpies for HW 8.67

Posted: Sun Jan 17, 2016 10:46 pm
by 504594108
For part D for calculating benzene with resonance, why do you multiply 6 mols by the enthalpy of a single bond of C-C instead of the enthalpy of the C-C bond of benzene (the one with dots above the line)?

Re: Bond Enthalpies for HW 8.67

Posted: Sun Jan 17, 2016 11:01 pm
by 504650118
I'm pretty sure that the 6 is being multiplied with by the enthalpy of a C-C bond of benzene. In the answer key, it just writes out "C-C bonds, resonance," and it looks like a single bond. But, the value 518 kj/mol is the bond enthalpy for a C-C bond a benzene structure. So while the answer key writes it out as "C-C bonds, resonance," it is using the bond enthalpy value of a C-C bond of benzene (the one with dots above one line).