basic

Standard Enthalpy of Reaction Hess Law Calculator

ΔH_rxn = Σn_P ΔHf°(P) − Σn_R ΔHf°(R).

Calculates the standard enthalpy of reaction from standard enthalpies of formation using Hess's law for a reaction with up to two reactants and two products.

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

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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 = (n_C·ΔHf_C + n_D·ΔHf_D) − (n_A·ΔHf_A + n_B·ΔHf_B)

In depth

Calculates the standard enthalpy of reaction from standard enthalpies of formation using Hess's law for a reaction with up to two reactants and two products.