March 2022 0 7 Report
2. Зная соотношения элементов в соединении, составьте его формулу. Натрий: кислород=2:1

Сера: кислород=1:2

Бор: кислород=2:3

Углерод: водород=1:4

Натрий; хлор=1:1

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