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ρe=0,76g/cm3
mk=200g
* obliczam masę etanolu
m=V*ρ
m=0,76*12900
m=9804g
*Obliczam masę roztowru
mr=9804+200=10004g
*Obliczam Cp
cp=ms*100%/mr
cp=200*100/10004
cp=2%