You are Here: Home

# Bond enthalpy- Quick question watch

1. Write an equation, including state symbols, to represent the average C-H bond enthalpy on methane, CH4.

I literally don't have a clue what to do.
2. C-H (g) ----> C (g) + H(g)
then next to it, write delta H = whatever amount you're given for it in kJ mol.
I've got +413 for it!
3. that's just for one C-H bond btw, seeing as there are 4 you may have to balance it? orrr maybe 4 C-H ----> C (g) + 2H2 (g) .. whatever looks right from what you've learnt :|
4. (Original post by almxo)
that's just for one C-H bond btw, seeing as there are 4 you may have to balance it? orrr maybe 4 C-H ----> C (g) + 2H2 (g) .. whatever looks right from what you've learnt :|
If you are working out the average bond enthalpy for methane then it's:

1/4CH4(g) ---> 1/4C(g) + H(g)

Or put it another way one quarter the enthalpy change for:

CH4(g) ---> C(g) + 4H(g)

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 2, 2011
Today on TSR

### He broke up with me because of long distance

Now I'm moving to his city

### University open days

1. Norwich University of the Arts
Thu, 19 Jul '18
2. University of Sunderland
Thu, 19 Jul '18
3. Plymouth College of Art