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stezenie procentowe = 30%
gestosc d = 0,89g/cm3 = 890g/dm3
korzystamy ze wzory na ptzeliczenie stezen: Cmol=Cp*d/100%*M
masa molowa = 17 g/mol
podstawiamy do wzoru:
Cmol=30*890/100*17 = 15,70 mol/dm3