September 2021 0 16 Report
Срочно!!! Формула соединения, в котором массовые доли элементов составляют: 21%, 29%, и 50%. 1) Na2SO3, 2) Na2SO4, 3)Na2S2O3, 4) Na2S2O7. Правильный ответ надо решить. Заранее спасибо.
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