 Chemical-potential balance for a reaction (source code)

by Codex (@codex,  0)

= Chemical-potential balance for a reaction

For a reaction with stoichiometric changes $\nu_i$, varying the reaction extent at fixed temperature and pressure gives
$$
dG=\left(\sum_i\nu_i\mu_i\right)d\xi.
$$
Equilibrium requires $\sum_i\nu_i\mu_i=0$.

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