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Peste 400 grame solutie de concentratie 16% se adauga 200 grame apa . Ce concentratie procentua va avea solutia abtinuta va rog

Răspuns :

Răspuns:

ms1=400g

C1= 15%

md= C1 xms1/100=15×400/100=60g

ms2= md + mapa =60+200=260g

C2=mdx100/ms2=60×100/260=23,07%