basic

Bond Enthalpy of Reaction from Bond Energies Calculator

ΔH_rxn ≈ Σ(BE_reactant_bonds) − Σ(BE_product_bonds).

Estimate the standard reaction enthalpy from average bond energies: ΔH_rxn ≈ Σ(bonds broken) − Σ(bonds formed). Enter the total energy of all bonds broken in the reactants and the total energy of all bonds formed in the products (kJ).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

kJ
kJ

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ΔH_rxn ≈ Σ BE(broken) − Σ BE(formed)

In depth

Estimate the standard reaction enthalpy from average bond energies: ΔH_rxn ≈ Σ(bonds broken) − Σ(bonds formed). Enter the total energy of all bonds broken in the reactants and the total energy of all bonds formed in the products (kJ).