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dg=1,26g/cm³
Vw=150cm³
dw=1g/cm³
cp=?
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mg=Vg*dg=50cm³*1,26g/cm³=63g
mw=Vw*dw=150cm³*1g/cm³=150g
mr=mg+mw=63g+150g=213g
cp=mg*100%/mr=63g*100%/213g=29,6%