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enthalpy change formula using bond energies. D H rxn energy added to break reactant bonds energy released when making product bonds 1046 kJmol 1172 kJmol 126 kJmol. Therefore bond enthalpy values given in chemical data books are averaged values.
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The energy change is negative showing that energy is released to the surroundings so is an exothermic reaction. Bond energy is the amount of energy needed to break one mole of a particular bond. To calculate bond energy Add.
The Bond Enthalpy is the energy required to break a chemical bond.
Of energy released from forming bonds. Bond enthalpy is the energy that it takes to break one mole of a bond. DH1 436 kJ 243 kJ 679 kJ. H-Br 366 kJmol.
