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V=1dm³=1000cm³
d=1,18g/cm³
m=1000*1,18=1180g
Cp=ms*100%/mr
ms=295g
Cp=295g*100%/1180=25%
mw=(100%-Cp)*mr/100%
Cp=10%
mr=150g
mw=(100%-10%)*150g/100%=135g