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!!!!! This means that at constant P and T ∆G is always zero.
Please tell me is this correct or not.
If not tell me where.

The equations ΔE = q + w and ΔS = q/T apply only to a system that undergoes no chemical changes. Then it is no surprise that at constant P and T ΔG = 0, because G is a state function. If there is a reaction, you have to consider the energy and entropy changes between reactants and products.


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