Blake Chen
03/28/2024 · Junior High School
7.При растворении какой массы хлорида натрия в 100 г \( 15 \% \)-ного раствора хлорида натрия концентрация станет \( 20 \% \). A. 4,25 В. 5,25 С. 6,25 Д. 7,25
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Масса хлорида натрия, которую нужно добавить, чтобы концентрация стала \(20\%\) в \(100\) г \(15\%\) раствора, равна \(6.25\) граммов. Ответ: С. 6.25 граммов.
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