KnowraHess's lawLinked fromLinked fromThe 7 pages that link to Hess's law, each with the reason it gives.All 7Broader topic 1Related 6First law of thermodynamicsRelated: It follows from enthalpy being a state function under energy conservation.EnthalpyRelated: It permits reaction heat to be found by adding known enthalpy changes.Lattice energyRelated: It makes indirect calculation of lattice energy possible through a Born–Haber cycle.Bond dissociation energyRelated: It provides a route to bond dissociation enthalpies from known thermochemical data.Chemical thermodynamicsRelated: It allows reaction enthalpies to be assembled from measured reactions with known values.ThermochemistryRelated: It allows overall heat changes to be calculated from known reaction steps.