Hess's Law Calculator

Calculate enthalpy change (ΔH) using Hess's Law. Step-by-step method: combine reactions with reversal and multiplication. Formation enthalpies: ΔH°_rxn = Σ ΔH°_f(products) - Σ ΔH°_f(reactants) with 30+ standard values. Combustion enthalpies: scale combustion ΔH by coefficient. Bond energy method: ΔH = Σ BE(broken) - Σ BE(formed) with 25+ bond energies. Perfect for chemistry students.