CH4---CH3Cl---C2H6____C2H4------C2H5OH-----C2H4
CH4+Cl2= CH3Cl +HCl
2CH3Cl+2Na= C2H6 +2NaCl
C2H6= C2H4+H2
C2H4+H2O=C2H5OH
C2H5OH=C2H4+H2O
l
150 - 100 %
55 - x%
x150 = 55 × 100
× = 55 × 100
150
x = 36 2
3
Zn+2Br+2Na+SiO3=2Na+2Br+ZnSiO3
Zn+SiO3=ZnSiO3
Ag+NO3+K+Cl=K+NO3+AgCl
Ag+Cl=AgCl
CaO+H+NO=Ca+NO3+H2O
CaO+H=Ca+H2O
FeSO3+2H+SO4=2H+SO3+Fe+SO4
FeSO3=SO3+Fe
Zn(OH)2+2H+2Cl=Zn+2Cl+H2O
Zn(OH)2+2H=Zn+H2O
Na+OH+H+Br=Na+Br+H2O
OH+H=H2O
Только всё со степенями окисления