Germain Henri Hess studied heat changes accompanying chemical reactions. Hess's law expresses the additivity of compatible reaction enthalpies: reversing a reaction reverses the sign, and combining reaction equations combines their enthalpy changes. This makes it possible to obtain an otherwise inaccessible heat change from an enthalpy cycle.[ref]
A chemist who studied energy changes during chemical reactions; Hess's law bears his name.
Figure 1.
Portrait of Germain Henri Hess
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