basic

Combustion Heat from Hess's Law Summation Calculator

ΔH°_rxn = Σ ΔH°_f(products) − Σ ΔH°_f(reactants).

Applies Hess's law to calculate the standard enthalpy of combustion: ΔH°_rxn = Σ(ν·ΔHf°)_products − Σ(ν·ΔHf°)_reactants for up to three products and two reactants.

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

Inputs

kJ/mol
kJ/mol
kJ/mol
kJ/mol

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 ΔH°_f(products) − Σ ΔH°_f(reactants)

In depth

Applies Hess's law to calculate the standard enthalpy of combustion: ΔH°_rxn = Σ(ν·ΔHf°)_products − Σ(ν·ΔHf°)_reactants for up to three products and two reactants.