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Cp = ms*100%/mr
mr = ms*100%/cp
mr = 112g*100%/35% = 320g
zad. 18
mr = ms + mw
mr = 80g + 10g = 90g
Cp = ms*100%/mr
Cp = 10g*100%/90g = 11,1%
Zad.19
Cp = ms*100%/mr
ms = cp*mr/100%
ms= 70%*450g/100% = 315g
ms nie zmienia się, masa roztworu zmniejsza się o masę odparowanej wody gęstość wody 1g/cm³
masa odparowanej wody
m = V*d = 80cm³* 1g/cm³ = 80g
mr = 450g – 80g = 370g
Cp = ms*100%/mr
Cp = 316g*100%/370g = 85,4%
Zad. 20
Cp = ms*100%/mr
ms = cp*mr/100%
ms= 15%*280g/100% = 42g
masa wody
mw = mr – ms
mw = 280g – 42g = 238g