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8.Din 400g solutie de sare cu c=15% se evapora 100g apa.Ce concentratie va avea Solutia ramasa?
va rog
dau coroana


Răspuns :

ms1=400g
c1=15%
md1= c1xms1/100= 60g

ms2=ms1-m,apa evaporata=300g
md2=md1= 60g
c2= md2x100/ms2= 60x100/300=........................calculeaza !!!!