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d=1,02g/cm³
m=v*d
m=1000*1,02
m = 1020g roztworu
mr=1020g
ms=30,7g
Cp=ms*100%/mr
Cp=30,7*100/1020
Cp = 3%
Cp = ?
V = 1dm³ = 1000cm³
d = 1,02 g/cm³
m - d * v = 1020 g - masa roztworu
1020g - 100%
30,7g - x
x ≈ 3,01%
Proszę! <3