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Din 500 grame solutie de concentratie 20 la suta se evapora 100 grame de apa. Ce concentratie procentuala va avea noua solutie obtinuta?

Răspuns :

ms1=500g
c1=20%
c=mdx100/ms
md1= 20x500/100= 100g

md2=md1=100g
ms2=ms1-m,apa=400g
c2= 100x100/ 400=..........................calculeaza !!!!