Массовая доля H2O и SO2
Mr(H2O)=2*1+16=18 W(H)=2/18=0.11=11% W(O)=16/18=0.89=89% Mr(SO2)=32+2*16=64 W(S)=32/64=0.5=50% W(O)=32/64=0.5=50%