Odpowiedzi

2010-03-16T20:34:59+01:00
1)
mr=250g
cp=15%
mw=250g
cp1=?
cp=ms*100%/mr
ms=cp*mr/100%=15%*250g/100%=37,5g
mr1=mr+mw=250g+250g=500g
cp1=ms*100%/mr1=37,5*100%/500g=7,5%
2)
V=0,5dm³=500cm³
d=1,5g/cm³
cp=60%
ms=?
mr=d*V=1,5g/cm³*500cm³=750g
cp=ms*100%/mr
ms=cp*mr/100%=60%*750g/100%=450g