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d=m/V
m=d x V
m=100cm3 x 1,16 g/cm3
m=116g
Cp=ms/mr x 100%
17,1%=ms/116 x 100%
0,171=ms/116
ms=0,171 x 116
ms=19,84g
odp. Masa czystej substancji KOH po odparowaniu wody wynosi 19,84g