Выполнить превращения: Zn → ZnO
↓↓↓ ↓
ZnCl2 ↵
2Zn+O2=2ZnO
Zn+2HCl=ZnCl2+H2
ZnO+2HCl+ZnCl2+H2O
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2Zn+O2=2ZnO
Zn+2HCl=ZnCl2+H2
ZnO+2HCl+ZnCl2+H2O