Надо создать из приложений отрицательную и вопросительную 1)The old man s head was very old and with - id1716908720220605 от dana085 05.06.2022 06:43

Question

Другие предметы: Надо создать из приложений отрицательную и вопросительную 1)The old man s head was very old and with his eyes closed there was no life in his face.2)He was asleep in short time and he dreamed of Africa when he was a boy and the long golden because and the white beaches. ​

dana085 · Accepted Answer

Дано:                               Решение:
V(Н2О) = 200 мл           1) 3 %-ный раствор – это на 100 г р-ра – 3 г соли
w(соли) = 0,03 (3 %)          и 97 г воды
                                              2) m (200 мл Н2О) = 200 мл • 1 г/мл = 200 г
   m (соли) = ?                 3) m (соли) = ?
                                             3 г соли – на 97 г Н2О
                                                х           -     200 г Н2О
                                                х = 3 ∙200/ 97 = 6,2 г.
                                               Ответ: m (соли) = 6,2 г

MOGZ ответил