April 2022 0 2 Report
Закончите уравнений реакций горения: Mn + ? = MnO ( валентность Mn - 5, O - 2)
? + O2 = BaO( валентнось 2 элементов = 2 )
N2 + ? = NO ( валенстно N = 1, 0=2)
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