Difference between Enthalpy of atomisation and mean bond enthalpy?Watch
Looking at Cl2. Isn’t atomisation = mean bond enthalpy?
A good explanation would help.
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.
Atomisation requires standard states at the start, so I2 would be solid to gas, whereas bond enthalpy for I2 would be gas to gas.