CH4+Cl2=CH3Cl+HCl2)2CH3Cl+Na=C2H6+NaCl
M(газа) = М(О₂) * D(O₂) = 32 г\моль * 2 = 64
2Al+ 3Cl2=2AlCl3
2Li+H2=2LiH
3H2+Fe2O3=2Fe+3H2O
4NH3+5O2=4NO+6H2O
N(-3)-5e-->N(+2)
O2(0)+4e-->2O(-2)
4Zn+5H2SO4(k)=4ZnSO4+H2S+4H2O
Zn(0)-2e--> Zn(+2)
S(+6)+8e-->S(-2)