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120g - 5%
(120g + 80g) - X
120 x 5 = 200 x X
600 = 200X
3 = X
odp: Stężenie otrzymanego roztworu to 3%
ms=(Cp*mr)/100%
ms=(5%*120g)/100%=6g
Cp=ms/mr*100%
Cp=6g/(120g+80g)*100%=6g/200g*100%=3%