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# Difference between mean bond enthalpy and bond enthalpy. watch

1. What is the difference?

I was given 2 equations "CH4 --> CH3 + H" and "CH4--> C + 4H" and asked to identify which enthalpy represents each.
2. (Original post by polaritymolecule)
What is the difference?

I was given 2 equations "CH4 --> CH3 + H" and "CH4--> C + 4H" and asked to identify which enthalpy represents each.
Mean bond enthalpy is the average for a particular type of bond measured over many different types of molecule.

The bond dissociation enthalpy refers to a specific bond within a specific molecule.

The example 1 above specifies which bond is being broken in a determined molecule. It is the bond dissociation enthalpy.

Example 2 shows the total for four C-H bonds. Dividing this number by four gives you the mean bond enthalpy for C-H bonds in methane. In this case none of the actual bond enthalpies have this value...
3. Thank you very much. Exact explanation i was looking for

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