Chem Urgent Help

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Plz explain in detail....

i tried to search on internet but i am confused with co-efficents.. how to set up the equaiton .. plz help me ???



Bond enthalpy is the energy required to break a mole of a certain type of bond.

O=O = 495 kj/mol
S-F = 327 kj/mol
S=O = 523 kj/mol


Use average bond enthalpies to estimate the enthalpy delta H (rxn) of the following reaction:

2SF4 + O2 ---- 2OSF4

Express your answer numerically in kilojoules.

Thanks in Advance

  • Chem Urgent Help -

    SF4 we break 4 SF bonds. That times 2.
    O2 we break 1 O2 bond. That times 1.

    OSF4. We form 4 S-F bonds and 1 S=O bond. That times 2.
    Then BE reactants - BE products = delta H rxn.

  • Chem Urgent Help -

    can u plz figure out the answer for me .. its very urgent.. thnks ..
    i still didn't get it

    thnks a lot Dr bob

  • Chem Urgent Help -

    Just plug in the numbers and punch your calculator. The idea here is to show you how to do it, not to do it for you.

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