Răspuns:
1) 40g 18g
MgO + H2O => Mg(OH)2
10g xg
MMgO=24+16=49g/mol
MH2O =2×1+16=18g/mol
x=10×18/40=calculează
32 64
2. S+ O2==>SO2
16g yg
MS=32g/mol
MSO2 =32+2×16=64g/mol
y=16×64/32=32gSO2
SO2+H2O =H2SO3
md=32gSO2
mapă =182g
C=?
ms=md+mapă =182+32=220g
C=md×100/ms=32×100/220=14,54%