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in 100de grame de apa se pun 25g. zahar .Determinati concentratia solutiei

Răspuns :

c=mdx100/ms=md x 100 /m apa+md=>c=25 x 100/ 125=20 %
Concentratia solutiei = 25 / (100+25) = 25 : 125 = 1 : 5 = 2/10=0,20 = 20%