ΔG° denotes the gibbs free energy at standard condition, ΔG is meanwhile is not the standard condition. ΔG= ΔG° when all concentrations equal 1M and all initial pressure equal 1 atm.
ΔG° is the standard free energy change. It is applicable when all the components of the system are in their standard state.
ΔG = ΔG° +RTlnQ
ΔG° denotes the gibbs free energy at standard condition which for aqueous solution 1M or gases at 1 atm and in terms of the appendix in the book is 25C.
ΔG is meanwhile is not the standard condition.
Hence ΔG= ΔG° when all concentrations equal 1M and all initial pressure equal 1 atm.
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