, Why do need to consider chemical potential?
• Previously we have considered only the free energy of the
system (G).
• We have not considered the energy associated with the
separate molecules in the system.
• This is important because: If we double the size of a
system, the free energy of the system must also double (as
considering more molecules).
• However, the average energy of each molecule remains the
same.
• So G is not a good measure of stability for systems in which
the amount of substance can change.
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