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80 g - 100%
x g - 3 %
x = 3*80/100
x = 2,4 g
Należy rozpuścić 2,4 g jodu.
mr=80g
Cp=3%
Cp=ms*100%/mr
ms=Cp*mr/100%
ms=3%*80g/100%
ms=2,4g