August 2021 0 20 Report
Объясните, что означают записи: Пример: 3HNO2 – 3 молекулы сложного вещества, состоящего из 1 атома водорода, 1 атома азота, 2 атомов кислорода. Всего атомов в 1 молекуле – 4, в трех молекулах – 3*4=12
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