Enthalpy change calculator (ΔH from formation data)
Reaction enthalpy ΔH° from standard formation enthalpies: Σ ν ΔH_f°(products) − Σ ν ΔH_f°(reactants).
Calculator
How to use
ΔH from formation values
Use tabulated ΔH_f° (kJ/mol) with the balanced stoichiometric coefficients.
When to use
- Hess-style problems already broken into formation data.
- Quick verification of a reaction enthalpy at 298 K (standard states).
Educational use only. Double-check values for labs, homework, and exams.