Chemistry — Chemical Potential
Chemical potential, activity and the equilibrium condition.
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\mu_i = \left(\frac{\partial G}{\partial n_i}\right)_{T,P}
\mu = \mu^\circ + RT\ln a
\sum_i \nu_i \mu_i = 0\ \text{(equilibrium)}
dG = -SdT + VdP + \sum_i \mu_i\,dn_i