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Hard mean bond enthalpy multiple choice question?!

If the mean C-H bond enthalpy is +x, which of the following represents a process with an enthalpy change of +4x?

A C(g) + 4H(g) --> CH4(g)
B CH4(g) --> C(g) + 4H(g)
C CH4(g) --> C(s, graphite) + 2H2(g)
D C(s, graphite) + 2H2(g) --> CH4(g)

I haven't seen a question like this before, and I honestly haven't got a clue?! :s-smilie:
It's a fairly simple matter of knowing what the definitions of different sorts of enthalpies are.

A- Enthalpy of association
B- Enthalpy of dissociation
C- The reverse of formation enthalpy
D- Formation enthalpy

So; what category does the mean bond enthalpy fit into? What's the stoichiometric ratio between 1 mean bond enthalpy and the processes given in the choices?
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Avatar for Adorable98
Adorable98
OP
15
Original post by Infraspecies
It's a fairly simple matter of knowing what the definitions of different sorts of enthalpies are.

A- Enthalpy of association
B- Enthalpy of dissociation
C- The reverse of formation enthalpy
D- Formation enthalpy

So; what category does the mean bond enthalpy fit into? What's the stoichiometric ratio between 1 mean bond enthalpy and the processes given in the choices?


I looked at the mark scheme, and the answer is B) whys that??
Original post by Adorable98
I looked at the mark scheme, and the answer is B) whys that??


Do you know the definition for mean bond enthalpy?
Reply 4
Avatar for Adorable98
Adorable98
OP
15
Original post by Infraspecies
Do you know the definition for mean bond enthalpy?


Just went through my revision guide.. All sorted! :smile:

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