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mr=d*V, d=1,4g/cm3, Vr=300cm3
mr=1,4*300=420g
Cp=40%
Cp=(ms*100%)/mr => ms=(Cp*mr)/100%=(40*420)/100=168g
mH2O=mr-ms=420-168=252g
jesli cos jest niejasne pisz priv