October 2021 2 12 Report
Расставьте коэффициенты в схемах химических реакций.
а) Cu + O2 ⇒ CuO
б) Mg + HCl ⇒ MgCl2 + H2
в) Al(OH)3 ⇒ Al2O3 + H2O
г) Na + S ⇒ Na2S
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