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Автор - GHJJJJJJJtyty

ПОМОГИТЕ, СРОЧНО, ПОЖАЛУЙСТА

Ответ

Автор - INSOLENTPINEAPLLE

Ответ:

15

Объяснение:

Fe(OH)3 - тут 3 атома кислорода

3Н2SO4 - тут 12 атомов(3*4=12)

Итого: 15

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