Am nevoie de ajutor!!Dau coroana

Răspuns:
1.
S + O2 => SO2
2.
ms=246g
C=20%
md= C×ms/100=20×246/100=49,2g H2SO3
MSO2 =32+2×16=64g/mol
MH2SO3=2×1+32+3×16=82g/mol
64g...........................82g
SO2 + H2O => H2SO3
xg.............................49,2g
x=49,2×64/82=38,4g SO2
MS=32g/mol
32g..............64g
S + O2 => SO2
yg...............38,4g
y=38,4×32/64=19,2g S