Difference between Enthalpy of atomisation and mean bond enthalpy?

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HappyMedic2001
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Report Thread starter 2 years ago
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I still do not get it, specifically with diatomic molecules.

Looking at Cl2. Isn’t atomisation = mean bond enthalpy?

A good explanation would help.
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username1445490
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It is the definitions.

Atomisation = formation of 1 mole of gaseous atoms eg 1/2Cl2(g) --> Cl(g)
Bond enthalpy = breaking 1 mole of covalent bonds so Cl2(g) --> 2Cl(g)

So bond enthalpy is twice atomisation as it produces 2 moles of gaseous atoms.
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Pigster
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The other issue is around states.

Atomisation requires standard states at the start, so I2 would be solid to gas, whereas bond enthalpy for I2 would be gas to gas.
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