Given, ΔG°recation =−131.23kJmol−1and, ΔG°f(H+aq)=0 ΔG°reaction =∑[G°f(product )]−‌∑[G°f(reactant )]=[G°f(H+)+G°f(Cl−)]−[0] ∵G°f for elements in free state, i.e H2 and O2= zero ∵Ag+ ion will form AgCl with Cl− ions and conc. of [Ag+(aq)]=[Cl−(aq)] ∴ both are in 1:1 ratio G°f(Cl)=G°f=(Ag+)−131.25=G°f0[Cl−(aq)] Gf[Ag+(ai)]=−131.25kJ∕mol−1