Question: For a system in equilibrium, at a given T and P a) The entropy must be a minimum b) The enthalpy must be a minimum

For a system in equilibrium, at a given T and P

a) The entropy must be a minimum

b) The enthalpy must be a minimum

c) The internal energy must be a minimum

d) The Gibbs free energy must be minimum.

Please justify your correct answer and explain for other non-correct options.

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