M(FeSO3)=56+32+3*16=136
W(Fe)=56/136=0.41=41%
W(S)=32/136=0.24=24%
W(O)=48/136=0.35=35%
1)Al2S3+3Ca=2Al+3CaS
2Al+6HCl=2AlCl3+3H2
AlCl3+3NaOH=Al(OH)3+3NaCl
2Al(OH)3 при температуре =Al2O3+3H2O
1.2Al+3HgCl2=2AlCl3+3Hg
2.8HCl+K2MnO4=2Cl2+2KCl+MnCl2+4H20
3.2MnO2+O2+4KOH=2K2MnO4+2H2O
CH₂=CH₂ + HCl = CH₃-CH₂Cl
2CH₃-CH₂Cl + 2Na = CH₃-CH₂-CH₂-CH₃ + 2NaCl