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amir s
amir s asked in Science & MathematicsChemistry · 8 years ago

How do you calculate bond strength?

Ex: sum of all bond energies in CH4 is 1656 KJ/mol, whereas in CH3Cl, the sum is 1543 kj/mol. Calculate the C-Cl bond strength!

Update:

Thanks for the answer, but why did you divide it by 4?

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  • A.S.
    Lv 7
    8 years ago
    Favorite Answer

    so average bond energy of C-H = 1656/4 = 414 kJ/mole

    now CH3Cl has three C-H bonds and one C-Cl bond

    so 3 X 414 + C-Cl = 1543

    1242 + C-Cl = 1543

    C-Cl = 1543 - 1242 = 301 kJ/mole

    edit - there are 4 C-H bonds in CH4 and their total energy is 1656 kJ/mole

    so for 1 C-H bond it will be 1656/4 = 414 kJ/mole

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