basic

Bond Energy Reaction Calculator

ΔH from bonds broken minus bonds formed.

Estimate the enthalpy change of a reaction from average bond energies: ΔH ≈ Σ (bonds broken in reactants) − Σ (bonds formed in products), in kJ/mol.

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

Inputs

kJ/mol
kJ/mol

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 ≈ Σ E(broken) − Σ E(formed)

In depth

Estimate the enthalpy change of a reaction from average bond energies: ΔH ≈ Σ (bonds broken in reactants) − Σ (bonds formed in products), in kJ/mol.