Ajutati-ma,dau coroana
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Răspuns:
Explicație:
O2 +4 Na =2Na2O
S + 2K =K2S
H2SO4 +Mg =MgSO4 + H2
Fe +2 HCl= FeCl2 + H2
3Fe + 2O2 =Fe3O4
2Fe + 3Cl2=2 FeCl3
N2 +3H2=2NH3
H2 + Br2 = 2HBr
Cl2 +Ca = CaCl2
2Al + 3Cl2 =2AlCl3