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m(s)20g
m(rozp)=200g
m(r)=20+200=220[g]
c(p)=20g/220g*100%=9,09% - stężenie r-ru
ms= 20g
mr= 200g + 20g = 220 g
Cp=ms/mr *100%
Cp= 20g/220g * 100%= ok. 9,09 %
Odp. Stężenie procentowe wynosi ok. 9,09 %.