Quick chemistry question!?

Bond enthalpies and Mean bond enthalpies

I get it but...

Say like you were saying the bond enthalpy and mean bond enthalpy of CH4....

how would you write that as an equation?

And what does CH4 ----> C(s) + 4H(g) represent??

APPRECIATED MUCH!!!

C + 2h2?

Nambat

C + 2h2?

This

Reply 3

Nambat

I need to practice Enthalpies some more, those and Equilibrium along with Titrations are my achilies heel.

Reply 4

916-CALL-TURK

Nambat

I need to practice Enthalpies some more, those and Equilibrium along with Titrations are my achilies heel.

Not sure how much time you've got left, but this book was AMAZING for helping me work out calculations ...

Reply 5

Nambat

916-CALL-TURK

Not sure how much time you've got left, but this book was AMAZING for helping me work out calculation and the like ...

I actually have that book but i'm not up to enthalpies yet, i spend maybe about a week or two learning a single chapter(independant learner). And you have the BEST username ever.

Reply 6

916-CALL-TURK

Nambat

I actually have that book but i'm not up to enthalpies yet, i spend maybe about a week or two learning a single chapter(independant learner). And you have the BEST username ever.

I have to agree with you on that one :wink:

[+rep]

Reply 7

Zygroth

Rimmiie

Say like you were saying the bond enthalpy and mean bond enthalpy of CH4....

how would you write that as an equation?

And what does CH4 ----> C(s) + 4H(g) represent??

Bond enthalpy would be the enthalpy change of something like:
CH₄ -> CH₃ + H

Whereas mean bond enthalpy would be the enthalpy change of:

\mathrm{\frac{1}{4}CH_4 \rightarrow \frac{1}{4}C + H}

i.e. the enthalpy change for breaking all the bonds divided by the number of bonds.

The equation in the question is just the the breaking of all the bonds in CH4.