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0,05=ms/400
ms=20g
Cp=20/(400+100g wody) x 100%
Cp=4%
mr=500
cp=2000/500=4%
mr= 400g
Cp= ms/mr*100%
Cp*mr/100%= ms
ms= 5%*400g/100%
ms= 20g
Cp= ms/mr*100%
Cp= 20g/400g+100g*100%
Cp= 4%
stężenie procentowe tego roztworu wynosi 4%