At constant temperature and pressure, its states that given multiple species in solution, the products of the number of moles of a species in solution and the derivative of that species' chemical potential will sum to zero.
Escobedo and de Pablo modified a type of "integration" introduced by Kofke that is derived from this equation. The Lewis-Randall rule can be used to relate Henry's Law to this statement, while it itself is derived by differentiating the Euler equation. The Clausius-Clapeyron equation follows directly from this relation. At constant temperature and pressure, its states that given multiple species in solution, the products of the number of moles of a species in solution and the derivative of that species' chemical potential will sum to zero. For 10 points, name this equation that shows that the intensive variables of a system are not independent, named after a man with an eponymous phase rule and a French scientist-philosopher.
Escobedo and de Pablo modified a type of "integration" introduced by Kofke that is derived from this equation.
Gibbs-Duhem equation [prompt on partial answer]