Предмет: Математика, автор: sevinckurbanbekova

57. В растворе пищевой соды отношение массы соды к массе воды равно 2 : 23. Какова концентрация раствора? A. 7%; B. 10%; с. 8%; D. 5%. 200 дей за неделю. MO но он изгото

Ответы

Автор ответа: kris5345

Концентрация раствора = масса в-ва / масса всей жидкости * 100% = 2 / 25 *
100% = 8 %
Масса в-ва (в данном случае пищевой соды) = 2, масса воды = 23, масса всей жидкости = Масса в-ва + масса воды =25

Автор ответа: iramazurk

Ответ:

Пошаговое объяснение:

1) 2 + 23 = 25 (частей) — равен весь раствор

2) 2/25 * 100% = 200/25 = 8 (%) - концентрация раствора

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