Яку масу CaCl2 потрібно розчинити в 300 г води для одержання 5% розчину?

Яку масу CaCl2 потрібно розчинити в 300 г води для одержання 5% розчину?
- Предмет:
  Химия
- Автор:
  priscilla
- 6 лет назад

Ответы 1

Понятие 5% раствор означает, что в 100 г раствора содержится 5 г растворенного вещества. То есть на 95 г воды приходится 5 г вещества.
Исходя из этого можем составить пропорцию:
На 95 г воды приходится 5 г СаCl₂
На 300 г воды -------------------X г СаCl₂
Х = 300*5/95 = 15,79 г
Ответ: 15,79 г
- Автор:
  jovanburch
- 6 лет назад
- 0
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Яку масу CaCl2 потрібно розчинити в 300 г води для одержання 5% розчину?

Ответы 1

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