12、已知反应的标准平衡常数如下:-|||-_(2)O(l)arrow (H)_(2)(g)+1/2(O)_(2)(g) ; ^theta =1.28times (10)^-3-|||-(O)_(2)(g)arrow S(s)+(O)_(2)(g) ; ^theta =1.12times (10)^-12-|||-_(2)S(g)arrow (H)_(2)(g)+S(s) ; ^theta =4.35times (10)^-2-|||-则相同温度下, (H)_(2)O(l)+(H)_(2)S(g)-|||-arrow 3(H)_(2)(g)+S(O)_(2)(g) 的 ^-= __ o-|||-A ..36times (10)^4-|||-B ..36times (10)^6-|||-..86times (10)^20-|||-..36times (10)^-20