2.已知718.15 K时,Ag2O(s)的分解压为20974kPa,则在该温度下反-|||-应 _(2)O(s)=2(Ag)_(2)g(s)+1/2(O)_(2)(g) 的 (Delta )_(r)(G)_(m)^theta = ()cdot (mol)^-1 。-|||-A. -53.62 B.15.95-|||-C. -15.95 D. -30.90