Расставить коэффициенты в уравнения
20. Cu + O2 = CuO
21. CuSO4 + NaOH = Cu(OH)2 + Na2SO4
22. Fe(OH)3 = Fe2O3 + H2O
23. Fe + CuCl2 = Cu + FeCl3
24. Na + S = Na2S
25. CuO + HBr = CuBr2 + H2O
26. CO + O2 = CO2
27. Hg2O = Hg + O2
28. Fe(OH)3 = Fe2O3 + H2O
29. NH3 = N2 + H2
30. KNO3 + C = KNO2 + CO2
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