Răspuns:
1. md=50
C=25%
ms=md×100/C=50×100/25=200g
mapă = ms-md=200-50=150g
2. msolvent=120g
ms=480g
md=ms-msolvent=480-120=360g
C=md×100/ms=360×100/480=calculează
3. md=200g
ms=1000g
C=?
C=md×100/ms=200×100/1000= calculează
4. md=40
m solvent =360g
ms=md+mapă =40+360=400
C=md×100/ms=40×100/400=calculează
