Calculating Bond Enthalpies

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JamieVu_2C
Posts: 108
Joined: Thu Jul 25, 2019 12:16 am

Calculating Bond Enthalpies

Postby JamieVu_2C » Sun Feb 09, 2020 2:24 am

Is there a way to figure out the bonds that are being formed and broken without having to draw the structure of the molecule? For example, in the reaction of , would there be a way to figure out the bonds being broken and formed without drawing?

DanielTalebzadehShoushtari2A
Posts: 53
Joined: Fri Aug 02, 2019 12:16 am

Re: Calculating Bond Enthalpies

Postby DanielTalebzadehShoushtari2A » Sun Feb 09, 2020 7:49 am

Each reaction is different, so I don't think there's a reliable pattern you can follow for bond enthalpies. You can try to visualize the reaction if the molecules are small enough, but in the end, your safest bet is drawing the bonds.

PranaviKolla2B
Posts: 114
Joined: Fri Aug 30, 2019 12:17 am

Re: Calculating Bond Enthalpies

Postby PranaviKolla2B » Sun Feb 09, 2020 9:42 am

Can someone explain the process of calculating bond enthalpies after drawing the structures?

Sanjana Borle 2K
Posts: 111
Joined: Fri Aug 09, 2019 12:15 am

Re: Calculating Bond Enthalpies

Postby Sanjana Borle 2K » Sun Feb 09, 2020 10:32 am

Bond enthalpies should be given. The only type of problem that we would need bond enthalpy for is for calculating delta H, and subtracting the bonds formed from the bonds broken. In this case its usually helpful to draw out the structure.

Ying Yan 1F
Posts: 101
Joined: Fri Aug 02, 2019 12:16 am

Re: Calculating Bond Enthalpies

Postby Ying Yan 1F » Sun Feb 09, 2020 12:46 pm

Since single, double, and triple bonds all have different bond enthalpies, I believe the safest way to go about solving bond enthalpy question would be to draw out the lewis structure, so you can see the number of bonds formed between molecules.

TimVintsDis4L
Posts: 104
Joined: Sat Aug 17, 2019 12:17 am

Re: Calculating Bond Enthalpies

Postby TimVintsDis4L » Sun Feb 09, 2020 1:02 pm

Ya, I would simply draw out the Lewis Structures then compare the bonds. If one structure has 2 C-C bonds and the other has 1 C-C bond, then you can cancel 1 from each side to make the calculations easier.


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