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46g-------------------80g---------2g
20g---------------------x----------y
Masa powstałego wodorotlenku
X = 20g*80g/46g =34,78g
Masa wydzielonego roztworu
Y = 20g*2g/46g = 0,87g
Masa roztworu
mr = 110g + 20g – 0,87g =129,13g
c= 34,78g*100%/129,13g = 26,9%