# calculating bond enthalpies

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Thread starter 4 weeks ago
#1
Hi guys,
so my question is when doing bond enthalpies the equation is =
total energies of bonds broken - total energies of formed bonds

however when I am working out the enthalpy of formation bond enthalpies would I stick to the same calculation above or would it be the calculation to work out enthalpy of formation (products-reactants)
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4 weeks ago
#2
(Original post by Fa123123)
Hi guys,
so my question is when doing bond enthalpies the equation is =
total energies of bonds broken - total energies of formed bonds

however when I am working out the enthalpy of formation bond enthalpies would I stick to the same calculation above or would it be the calculation to work out enthalpy of formation (products-reactants)
What does "enthalpy of formation bond enthalpies" mean?
0
Thread starter 4 weeks ago
#3
(Original post by charco)
What does "enthalpy of formation bond enthalpies" mean?
I mean the question is about bond enthalpies. But one of the questions says the enthalpy of formation of that compound
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4 weeks ago
#4
(Original post by Fa123123)
I mean the question is about bond enthalpies. But one of the questions says the enthalpy of formation of that compound
Every type of energy transformation is carefully defined. You cannot mix concepts.

You can work out the enthalpy of formation using bond enthalpy terms providing that all components are gases.
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Thread starter 4 weeks ago
#5
(Original post by charco)
Every type of energy transformation is carefully defined. You cannot mix concepts.

You can work out the enthalpy of formation using bond enthalpy terms providing that all components are gases.
So when i do enthalpy of formation using bond enthalpy terms would the equation;
sum of bonds broken - sum of bonds formed?
0
4 weeks ago
#6
(Original post by Fa123123)
So when i do enthalpy of formation using bond enthalpy terms would the equation;
sum of bonds broken - sum of bonds formed?
yes
0
4 weeks ago
#7
https://www.science-revision.co.uk/Bond_energies.html
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