А) 6
Б) 6)
В) 2
Г) 4
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2H2+O2=2H2O
H2+Cl2=2HCl
3H2+N2=2NH3
H2+Ca=CaH2
2S+3O2=2SO3
S+H2=H2S
2Na+S=Na2S
3Al+2S=Al3S2