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400 gr saramura
c1=25%
c2=40%

Aflați cantitatea de apa evaporat


Răspuns :

C1=md1/ms1*100 => md1=C1*ms1/100=400*25/100=100g saramura 

ms1=md1+mH2O=>mH2O=ms1-md1=400-100=300g

C2=md1/md1+mH2O*100 => 40=100/100+mH2O*100 => 4000+40mH2O=10000 => 6000=40mH2O => mH2O=150g

mH2O evaporata = mH2Oi-mH2O final = 300-150 = 150g