## Calculating Bond Enthalpies

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

### Calculating Bond Enthalpies

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 $CH_{3}CHCH_{2}(g) + H_{2}O(g) \rightarrow CH_{3}CH(OH)CH_{3}(g)$, would there be a way to figure out the bonds being broken and formed without drawing?

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

### Re: Calculating Bond Enthalpies

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

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

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

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

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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