Question

Z 300g 5-procentowego roztworu odparowano 30g wody. Oblicz stężenie procentowe otrzymanego roztworu.

Answer 1

Cp=300g*5%/(300g-30g))*100%
Cp=15g/270g*100%
Cp=5g/90g*100%
Cp=0,0(5)*100%
Cp~5.56%

Answer 2

Mr = 300g
Cp = 5%
ms = ?

100% - 300g
5%    -    x

x = (5 x 300) : 100 = 15g - ms

mr = 300g - 30g = 270g
ms = 15g
Cp = ?

Cp = (15g x 100%) : 270g = 5,56%