Reading bond energy tables

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bdc142

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When reading bond energy tables for multiple bonds (ex. C triple bonded to C), is the given bond energy the energy needed to break all THREE bonds? Or just the second pi-bond?
 

chiddler

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all three.

it's also how much energy is released when the elemental atoms form bonds

like if C-O is 100, then you put in 100 to break it. but then you also get 100 when it reforms.

which is why enthalpy is deltaH = bonds broken - bonds formed, making it negative equating with heat release because reforming more stable bonds has a net release of heat.
 
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