November 2021 0 3 Report
Рассчитай, чему равна массовая доля (в %) химического элемента кислорода в дигидрате щавелевой кислоты H2C2O4⋅2H2O. Ответ: (впиши с точностью до одного знака после запятой)

w(O)= %
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