M(SO3)=32+16*3=80 M(S)=32 ω(S)=32/80*100%=0,4*100%=40% M(O3)=16*3=48 ω(O3)=48/80*100%=0,6*100%=60% Ответ:ω(S)=40%; ω(O3)=60%