Răspuns:
Explicație:
H2SO3
- se afla masa molara
M=2+32+3.16=82----------> 82g/moli
82g H2SO3------------2g H------------32gS----------------48gO
100g----------------------------x---------------y------------------------z
x=100 . 2 : 82=2,44 % H
y=100 . 32 : 82=39,02 % S
z=100.48 : 82=58,54 % O