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the enthalpy change in a chemical reaction can be determined using bond energies. energy must be...

the enthalpy change in a chemical reaction can be determined using bond energies. energy must be added or absorbed to break bonds and that energy is released when bonds are formed. therefore ,you can calculate the total enthalpy of the reaction using following formula: dH= bonds broken-bonds formed


Using bond energies, calculate the change in energy that accompanies the following reaction:

H2 + O2 -> 2H2O



Bond Bond Energy

H-H 432 kJ/mol

O-O 498 kJ/mol

H-O 467 kJ/mol
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Answer #1

2H2 + on 24o ,ou Ath & Bond broken - Bonde Formed xn -- 2x4 32 + 498 - 2 (2x467) - 1362 - 1868 = - 506 kg (Ahorn = – 506 Kg R

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