Meegan543210
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In the AS level chem specification it says: "explain why values from mean bond enthalpy calculations differ from those determined using Hess’s law."

I'm a bit unsure as to why?? So I would appreciate if someone could explain this to me, thanks
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VioletPhillippo
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(Original post by Meegan543210)
In the AS level chem specification it says: "explain why values from mean bond enthalpy calculations differ from those determined using Hess’s law."

I'm a bit unsure as to why?? So I would appreciate if someone could explain this to me, thanks
Hiya,

I think it's because for Hess's law it is the bond enthalpy for that specific reaction whereas for a mean bond enthalpy it is the mean bond enthalpy for that bond over several different reactions.
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OneOfTheBillions
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With Hess's law you look at the energy of formation and combustion from the elements whereas with the mean bond enthalpy you look at the energy from the bonds which is not as accurate as its different in different molecules so a mean has to be taken.
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