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m = d*V
mr = 1,146 * 80 = 91,68g
ms = Cp * mr/100%
ms = 18 * 91,68/100 = 16,5g
mH2O = d * V
mH2O = 1 * 35 = 35g
Cp = ms * 100%/(mr+mH2O)
Cp = 16,5g * 100%/(91,68g+35g)
Cp = 13%
Odp.: Stężenie procentowe tego roztworu wynosiło 13%.