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mr=200g
mH2O=200g-60g=140g
140g+40g=180g
180+60=240
Cp=60/240 *100%=25%
Cp=25%
200 g - 60 g = 140 g (masa wody)
II roztwor (po dolaniu)
140g wody + 40 g wody = 180 g
czyli stezenie m soli/ m roztworu * 100 %
m roztworu = 180 g wody + 60 g soli = 240g
60/240 * 100 % = 25 %