M (NaCL) = 50г, mводы=H2O ⇒mр-ра=300г+50г=350 г, w% (NaCl) = 50г*100%/350г = 15%
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M (NaCL) = 50г, mводы=H2O ⇒mр-ра=300г+50г=350 г, w% (NaCl) = 50г*100%/350г = 15%