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What is the F-F bond energy?

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What is the F-F bond energy?

Post  pplantblues on Mon Nov 17, 2008 7:19 pm

The reaction of H2 with F2 produces HF with delta H= -269kJ/mol of HF. If the H-H and H-F bond energies are 432 and 565 kJ/mol, respectively, what is the F-F bond energy? kJ/mol
H2(g)+F2(g)-> 2HF(g)
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Re: What is the F-F bond energy?

Post  bfrsoccer on Mon Nov 17, 2008 9:47 pm

I think the way to solve this problem is:

By the way the bond energies are defined

deltaH (at standard conditions, 1atm pressure and 25 degrees Celsius, for which the bond energies are normally defined at)=sum of bond energies of reactants-sum of bond energies of products

meaning

-269*2=(432+x)-565*2; (the "*2" parts are there because 2 moles of HF are produced)

x=160kJ/mol is the answer
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Re: What is the F-F bond energy?

Post  pplantblues on Mon Nov 17, 2008 10:40 pm

Thank you for your thorough explanation.
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Re: What is the F-F bond energy?

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