Răspuns:
S + O2 = SO2
SO2 + H2O -> H2SO3
246g H2SO3 20%
C/100 = Md/Ms
Md = 20 ori 246/ 100
Md = 49.2g de H2SO3.
In 64g SO2....82g H2SO3
In xg SO2..... 49,2g H2SO3
x= 64 ori 49,2/82
x= 38,4 g SO2
32g S.......64gSO2
y g S........ 38,4g SO2
y = 32 ori 38,4/64
y=19,2g S supus arderii.