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Cp= 6%
Cp2= 3%
cp= (ms/ mr)*100%
mr=ms+ m H2O
6%=(ms/250)*100%
0,06=ms/250
ms=15g
3%=(15/ 250+mH2o)*100%
0,03=15/ (250+mH2O)
7,5+ 0,03 m H2O=15
0,03m H2O=7,5
m H2O=250g
odp: Trzeba dolac 250 g wody.