Cum sa aflam masa substanţei dizolvate şi masa apei daca masa soluţiei este 400g si partea de masa a subst. dizolvate in soluţie 20%
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20/100 = md/400
md = 20•400/100 = 80 g
ms = md + m apa
400 = 80 + M apa
m apa = 320 g