BRAINCAKECalculations using Mean Bond Enthalpies
To estimate an enthalpy change from bond enthalpies, imagine the reaction happening in two stages: first every bond in the reactants is broken, then every bond in the products is made.
ΔrH = Σ(bonds broken) - Σ(bonds made)
Both sums use the positive bond enthalpy values; the subtraction gives the sign.
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Key terms in this lesson
- mean bond enthalpy
- The average energy needed to break one mole of a particular covalent bond, measured over a range of compounds, with all species gaseous.
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All 10 lessons in Bond Enthalpy · All Edexcel AS-level Chemistry topics