June 2023 1 11 Report
Знайдіть масові частки кожного елемента в хімічній формуле С2Н4 (Ar C=12.) ArH= 1)ДАЮ 50 БАЛЛОВ СРОЧНО!!!!​ОСТАЛОСЬ 4 МИНУТЫ!! ТОЛЬКО БЕЗ Г МОЛЬ!!7 КЛАСС!!!УМОЛЯЮ СРОЧНО!!!!!
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