1. mH2SO4=2*1u+32u+4*16u=98u
2u---x%
98u---100%
x=2,04%H
32u---x%
98u---100%
x=32,65%S
100%-(2,04%+32,65%)=65,31%O
2. mH2SO3=2*1u+32u+3*16u=82u
2u---x%
82u---100%
x=2,44%H
32u---x%
82u---100%
x=39,02%S
100%-(2,44%+39,02%)=58,54%O
3. mH2S=2*1u+32u=34u
2u---x%
34u---100%
x=5,88%H
100%-5,88%=94,12%S