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V=2dm³=2000cm³
d=1,68g/cm³
mr=2000*1,68=3360g
ms=Cp*mr/100%
Cp=20%
ms=20%*3360/100%=672g
V= 2 dm3= 2000 cm3
d= 1,68 g/cm3
Mamy wzór d=m/V i przekształcamy go do postaci m= d*V
m= 1,68*2000
m= 3360g
Cp= ms*100%/mr
20%= ms*100%/3360
67200=ms*100%
ms=672 g