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St.% = (ms / mr) *100%
ms = 40 g
mr = ms + mw
mr = 40 g + 360 g
mr = 400 g
St.% =(40 g /400g) * 100%
St.% = 10%
Odp.: Stężenie procentowe tego roztworu wynosi 10%.
2.
mr = 300g
ms = 6g
St.% = (6 g / 300 g ) * 100%
St.% = 2%
Odp.: Stężenie procentowe roztworu wynosi 2%.
3.
mw = 440 g
ms = 60 g
mr = 440g + 60 g
mr = 500 g
St.% = (60 g / 500g) * 100%
St.% = 12 %
Odp.: Stężenie procentowe roztworu wynosi 12%.