bond enthalpy equations

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Raquel Ruiz 1K
Posts: 30
Joined: Tue Nov 14, 2017 3:02 am

bond enthalpy equations

Postby Raquel Ruiz 1K » Sat Feb 02, 2019 5:25 pm

What are the steps to help solve bond enthalpy equations? I'm having a hard time understanding.

Griffin Carter 2I
Posts: 16
Joined: Wed Nov 14, 2018 12:23 am

Re: bond enthalpy equations

Postby Griffin Carter 2I » Sat Feb 02, 2019 5:39 pm

If by solving bond enthalpy equations you mean using bond enthalpies to find the enthalpy of a reaction then you want to first find out which bonds are being broken and which are being formed. Then you sum the enthalpies of the breaking bonds and the forming bonds separately. Then you subtract the sum of the formed bonds from the broken bonds.

anthony_trieu2L
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: bond enthalpy equations

Postby anthony_trieu2L » Sat Feb 02, 2019 5:46 pm

Bond enthalpy is defined as the amount of energy required to break a bond. You can calculate bond enthalpy of a reaction by subtracting the total bond enthalpies of products from the total bond enthalpies of reactants.

Eruchi Okpara 2E
Posts: 53
Joined: Fri Sep 28, 2018 12:28 am

Re: bond enthalpy equations

Postby Eruchi Okpara 2E » Sat Feb 02, 2019 7:22 pm

When solving for the enthalpy of a reaction, how do you know which bonds are supposed to be broken?

MadelynNguyen1F
Posts: 59
Joined: Fri Apr 06, 2018 11:04 am

Re: bond enthalpy equations

Postby MadelynNguyen1F » Sat Feb 02, 2019 7:34 pm

I believe Dr.Lavelle drew out the structure of each reactant and product in order to help us visualize which bonds were being broken.

Sierra Cheslick 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:27 am

Re: bond enthalpy equations

Postby Sierra Cheslick 2B » Sat Feb 02, 2019 7:53 pm

In order to see which bonds are being broken, you can draw out the structures and see which ones would need to break in order to form the new structure. However, I think you can also just subtract the energy needed to break all the bonds from the energy released from forming all the bonds, which might be easier.

Celine Hoh 2L
Posts: 66
Joined: Fri Sep 28, 2018 12:28 am

Re: bond enthalpy equations

Postby Celine Hoh 2L » Sat Feb 02, 2019 7:53 pm

Yes drawing out the structures really worked for me


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