W(NaCl) = [m(NaCl)/m(р-р)] * 100% = (20/250) * 100% = 8% (0,08)! ответ: вариант 3).
20/250 = 0.08*100% = 8%................................................
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W(NaCl) = [m(NaCl)/m(р-р)] * 100% = (20/250) * 100% = 8% (0,08)!
ответ: вариант 3).
20/250 = 0.08*100% = 8%
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