5.Расставьте коэффициенты в уравнениях химических реакций:
A) Cu + O2 → CuO (1)
B) Mg + HCl → MgCl2 + H2↑ (1)
C) P + O2 → P2O5 (1)
D) Са(ОН)2 → СаО + Н2О (1)
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