Calculating bond energy

Started by ann, October 17, 2022, 02:39:51 PM

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ann

I am still confused about how to set up this problem and find the answer.

chenbeier

Some datas missing

https://www.u-helmich.de/che/lexikon/B/BilderB/Bindungsenergie-1.jpg

6 x Cl-F = 1 ? Cl-Cl + 3 x F-F + 803
F-F =( 6 x Cl-F - 803 - 1x Cl-Cl)/3
F-F = 158 KJ

uma

Quote from: ann on October 17, 2022, 02:39:51 PM
I am still confused about how to set up this problem and find the answer.
I think  we did this question in class also.
Remember
Bond breaking is endothermic
Bond formation is exothermic

Delta H (reaction) = Total energy needed to break the bonds - Total energy released on formation of bonds.
Draw Lewis dot structures of all reactants and products.
Check what all bonds are broken and what all are formed.
Use reference table of bond enthalpies and the number of moles of each type of bond.
Use above equation to get the answer.

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