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m=1,5 x 20
m=30g subst
Cp=ms/mr x 100%
Cp=30/(500+30) x 100%
Cp=5,7%
m=v*d
m=20cm3*1,5g/cm3
m=30g
Z def. stęż. procent.
30g subst.-------530g roztworu(30g subst. + 500g wody)
xg subst.--------100g roztworu
x=5,66g subst.
x=5,66%