Răspuns:
pentru apa+sare
m solvent= ms-md=400-20=380 g
c= md*100/ms=20*100/400=5%
pentru apa+soda de sulf
20=md*100/500 se simplifica prin 100
md=5*20=100g
m solvent=500-100=400g
pentru alcool+iod
ms=240+60=300 g
c=60*100/300=20%
pt apa+acid sulfuric
40=80*100/ms
ms=80*100/40=200g
m solvent= 200-80=120 g
pt apa + alcool
ms=md+m solvent
md=ms-m solvent
md= 800-600=200 g
c=200*100/800=25%
pt apa+zahar
ms=m solvent+ md
ms=160+40=200 g
c=40*100/200=20%
Sper ca te am ajutat!
