The balanced equation is 2AgNO3(s) ---> 2Ag(s)+2NO2(g)+ O2 (g) achieved through elemental balance from each side.We check in 2 if the resulting mass of O2 is equal to that produced from 54 agno3. In this case, the O2 produced is 5.08 grams.. this is equal to 90.44% yield. Hence the answer is 31.01 grams Ag.