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V= 400cm3
ms=58g
d=1,6g/cm3
d=m/v
m=d*v
m=1,6*400= 640g <--- mr
Cp= (ms*100%)/mr
Cp=(58*100)/640
Cp=9.06%
2.
ms=?
mr= 450g
Cp= 39%
Cp= (ms*100%0/mr
ms=1(100% * Cp) / mr
ms= (100*39)/450
ms= 8,6g