Расставьте коэффициенты в реакциях.

1) N2 + H2 = NH3
2) Al(OH)3 = Al2O3 + H2O
3)Fe+ HCl= H2+ FeCl2
4) Al + S = Al2S3
5) СН4 + О2 = СО2 + Н2О
6)CuS + O2 = CuO + SO2
7)Na2S+HCl= NaCl+H2S
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