# 18: Fundamental 13 - Composition Changes

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• 18.1: Partial Molar Quantities
Because they are easy to control in typical laboratory experiments, pressure, temperature, and the number of moles of each component are the independent variables that we find useful most often. Partial derivatives of thermodynamic quantities, taken with respect to the number of moles of a component, at constant pressure, temperature, and θk, are given a special designation; they are called partial molar quantities.
• 18.2: Chemical Potential
The chemical potential tells how the Gibbs function will change as the composition of the mixture changes. And since systems tend to seek a minimum aggregate Gibbs function, the chemical potential will point to the direction the system can move in order to reduce the total Gibbs function.
• 18.3: ∆rG is the rate at which the Gibbs Free Energy Changes with The Extent of Reaction
• 18.4: Molar Reaction Enthalpy

18: Fundamental 13 - Composition Changes is shared under a not declared license and was authored, remixed, and/or curated by Andrea Allgood Carter.