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masa roztworu=masa subst. rozpuszcz. + masa wody
Cp=30g/(210g+30g) *100%=30g/240g *100%=100%/8=12,5 %
Cp=(30g:240g)*100%
Cp=12,5%
Odp: Stężenie procentowe w tym roztworze wynosi 12,5%