1. Расставить коэффициенты в схемах уравнений реакций:
Na+Cl2=NaCl
Zn+CuCl2=ZnCl2+Cu
Al+S=Al2S3
H2SO4+Na2SO4+H2O
K2SiO3+HCl=KCl+H2SiO3
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