3. Определите массовую долю вещества в растворе, полученном при рас- творении вещества массой 8 г в воде массой 12 г.
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15.05.2021 10:56
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Дано:
m(вещества) = 8 г.
m(H2O) = 12 г
Найти:
w( вещества) = ?
w(вещества) = m( вещества)/ m(раствора)
m(раствора) = m( вещества) + m(H2O) = 8г + 12г = 20г
w(вещества)= 8г/20г = 0.4 ( в долях) и 0.4*100%= 40%
ответ: w(вещества) = 0.4 или 40%