Răspuns:7] ms=400g C%=20% C%=md.100/ms md=C%.ms/100=20.400/100=80g substanta dizolvata ms= md+ mH2O mH2O= ms- md=400-80= 320gH2O Ro H2O[densitatea]= mapa/v olum vol=mapa /ro=320g/1g/cm3=
vapa=300cm3 10] md=500g C%=10% C%=md.100/ms ms=500.100/10= 5000g mapa =ms-md=5000-500=4500g Ro apa=1g/cm3 ro=mapa/vol vol apa= mapa/Ro=4500g/1g/cm3=4500cm3=4,5L 13] m Apa = 450g C% =10% ms=md+mapa C%=md.100/ms C%=md.100m/md+mapa se prelucreaza aceasta relatie C% [md+mapa]=100md C%md+C%mapa=100md C%.mapa=md[100-C%] md=C%.mapa/100-C%=10.450/100-10 md=4500/90=50g subst dizolvata ms=md +mapa 50+450=500g
