Обчислити масові частки елементів в алюміній оксиди
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20.05.2020 11:29
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Объяснение:
Відомо: Al2O3 Знайти: W(Al)-?
Розв'язання:
Аr(Al)=27
Mr(Al2O3)=2·Ar(Al)+3·Ar(O)=2·27+3·16=102
W(Al)=2·Ar(Al)/Mr(Al2O3)=2·27:102=0,53
або, помноживши це число на 100%, отримаємо 53%
Відповідь: W(Al)=0,53 або 53%.