Bond Enthalpy Question Help

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Kayla Farris 1E
Posts: 5
Joined: Wed Sep 21, 2016 2:59 pm

Bond Enthalpy Question Help

Postby Kayla Farris 1E » Fri Jan 13, 2017 12:35 am

On page 16 of the course reader in the last example on the page, why would you not add in the bond enthalpy of the C-H bond?

Sydmon Nguyen-Tran 1N
Posts: 21
Joined: Wed Sep 21, 2016 2:59 pm

Re: Bond Enthalpy Question Help

Postby Sydmon Nguyen-Tran 1N » Fri Jan 13, 2017 1:46 am

When drawing out the Lewis structures for the reactants, it can be seen that the only bonds broken are between the C=C of the CH2 molecules and the bond between the H and Br atom. For the products, only one C-H bond is formed from the broken bond in the reactants, which is taken into account in the calculation.

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