例3 298K和p^θ压力下,有化学反应:-|||-_(2)S(O)_(4)(s)+(H)_(2)((O)^6)=2Ag(s)+(H)_(2)S(O)_(4)(0.1molcdot (L)_(4))cdot (k)_(2)(g)^-1-|||-已知 (varphi )_(50dfrac {pi )(2)}-|(A)_(2)(50)^|A|(|_{k)}=0.627V, (varphi )_(Ag)+(mu )_(B)=0.799V-|||-(1)试为该化学反应设计一可逆电池,并写出其电极和电池反应进行验证。-|||-(2)试计算该电池的电动势E,设活度因子都等于1。-|||-(3)计算Ag2SO4 (s)的活度积常数K