Question

Calculate the bond dissociation energy for the C5H8 molecule shown below:


A. 4,909 kJ/mol

B. 5,772 kJ/mol

C. 3,270 kJ/mol

D. 5,152 kJ/mol

Picture attached.

Answer 1

some thing missing in question i think

Answer 2

you need bond dissociation energy table for this

Answer 3

theres 9 C-H bonds single bonds, 2 C=C double bonds, 2 C-C single bonds.

Answer 4

yaaa ur right @gedtajia

Answer 5

Ok, I calculated and got 5,612. And none of the answers match with this. What did I do wrong :(?

Answer 6

how did u calculate it ?can i see it

Answer 7

9 C-H bond = (9)(410)
2 C=C bond = (2)(611)
2 C-C bond = (2)(350)

Answer 8

And then I added them together

Answer 9

@chmvijay

Answer 10

you have 8 C-H bonds, not 9

Answer 11

Ok then let me calculate once more

Answer 12

I got 5,202

Answer 13

@JFraser

Answer 14

and is there really an important difference between 5202kJ and 5152kJ?

Answer 15

So D would be the right answer then?

Answer 16

@JFraser

Answer 17

it's clearly the best option. whoever wrote the question probably used a sligthly different table of bond enthalpies, but it's all the same thing

Answer 18

Thanks!!!