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# Working out Bond Enthalpy from a Born Haber cycle? Watch

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1. How would you find the value of a F-F bond from this data? I've drawn a correct cycle out but the calculation doesn't make sense to me. My teacher missed this part out of our lessons so any help would be appreciated :-) It is in context of AgF.

Enthalpy change Value / kJ mol–1
Enthalpy of atomisation for silver +289
First ionisation energy for silver +732
Electron affinity for fluorine –348
Experimental enthalpy of lattice dissociation for silver fluoride +955
Enthalpy of formation for silver fluoride –203

Spoiler:
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E(F–F) + 732 + 289 + +203 = 348 + 955
E(F–F) = 79
2E(F–F) = 158 KJ/mol
2. (Original post by typicalvirgo)
How would you find the value of a F-F bond from this data? I've drawn a correct cycle out but the calculation doesn't make sense to me. My teacher missed this part out of our lessons so any help would be appreciated :-) It is in context of AgF.

Enthalpy change Value / kJ mol–1
Enthalpy of atomisation for silver +289
First ionisation energy for silver +732
Electron affinity for fluorine –348
Experimental enthalpy of lattice dissociation for silver fluoride +955
Enthalpy of formation for silver fluoride –203

Spoiler:
Show
E(F–F) + 732 + 289 + +203 = 348 + 955
E(F–F) = 79
2E(F–F) = 158 KJ/mol
The silver fluoride Born Haber cycle is fundamentally the same as the sodium chloride cycle, to which I am linking you ...

3. (Original post by charco)
The silver fluoride Born Haber cycle is fundamentally the same as the sodium chloride cycle, to which I am linking you ...

Thank you!!!!!

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Updated: October 8, 2016
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