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ms =400g
mr= 400g +1600g = 2000g
C%= (400/2000)*100 = 20%
1,6kg-masa rozpuszczalnika 1,6kg=1600g
400g+1600g=2000g - masa roztworu
100% - 2000g
x - 400g
x=100%*400/2000 %
x=40000/2000 %
x=20%
Odp: Stężenie procentowe tego roztworu wynosi 20%.