p% = m(соли,г)*100% / m(раствора,г) = m*100% / 400 = m/4 (%)
m = 72 г; p% = 72 г / 4 = 18%
m = 160 г; p% = 160 г / 4 = 40%
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p% = m(соли,г)*100% / m(раствора,г) = m*100% / 400 = m/4 (%)
m = 72 г; p% = 72 г / 4 = 18%
m = 160 г; p% = 160 г / 4 = 40%