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V = 60 cm³
m = d * V
m = 60 cm³ * 1,5 g/cm³ = 90 g
100 % ----- 90 g
5 % ------ x g
x g = 5 % * 90 g / 100 % = 4,5 g
d=1,5g/cm³
m=v*d
m=60*1,5
m = 90g
mr=90g
Cp=5%
ms=Cp*mr/100%
ms=5*90/100
ms = 4,5g kwasu