a)H2S.
Mr(H2S)=2+32=34
w(H)=2/34=0,05(5%)
w(S)=32/34=0,9(90%)
б)H2SO3.
Mr(H2SO3)=2+32+16*3=82
w(H)=2/82=0.02(2%)
w(S)=32/82=0.39(39%)
w(O)=64/82=0.78(78%)
в)H2SO4.
Mr(H2SO4)=2+32+16*4=98
w(H)=2/98=0.02(2%)
w(S)=32/98=0.32(32%)
w(O)=64/98=0.65(65%)
