Bond Enthalpies

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hannah_flagg_3F
Posts: 10
Joined: Wed Sep 21, 2016 2:57 pm

Bond Enthalpies

Postby hannah_flagg_3F » Sun Jan 15, 2017 7:33 pm

In using bond enthalpies to calculate delta h of the reaction, how do you determine which bonds are broken or formed? Do you just break all of them and reform them after the reaction or is there a way to tell which ones to break and which ones to form?

Winnie Liu 1M
Posts: 11
Joined: Fri Jul 15, 2016 3:00 am

Re: Bond Enthalpies

Postby Winnie Liu 1M » Sun Jan 15, 2017 8:02 pm

Both ways can work, though breaking and forming every single bond would be a bit time consuming (I think Dr. Lavelle said this in Weds lecture during an example). To figure out which ones are broken and which ones form though, he drew the structures of the molecules (both reactants and products) and circled/pointed out the bonds that changed.


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