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henry3369
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Homework Statement
I don't actually need help with an entire problem, I just can't seem to figure out what goes on when an atom is formed from a molecule in a Born-Haber cycle.
For example:
The formation of a chlorine atom from a chlorine molecule
(1/2)Cl2 → Cl(g) ΔH = (1/2) x bond energy of Cl2 = +122 kJ
Homework Equations
The Attempt at a Solution
Why is the bond energy being halved? It you have a Cl2 molecule, and you need 244 kJ to break the bond into two Cl atoms. Why would the formation of a Cl atom be only half of that then?