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1. Chemical Potential

   Linked via "reservoirs"

   From this, the chemical potential is derived as:
   $$\mu = \left(\frac{\partial G}{\partial N}\right){T, P, N{\text{other}}} \label{eq:thermo}$$
   The chemical potential is crucial because it dictates the spontaneity-of chemical reactions and mass transfer. Equilibrium/) between two phases/) or two reservoirs/) of the same substance is established only wh…