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m roztworu1=200g
m substancji1=?
ms1= 20%*200g/100%= 40g
Cp2=10%
m roztworu2=100g
m substancji2=?
ms1=10%*100g/100%=10g
Cp3=?
m substancji3=40g+10g=50g
m roztwotu3=200g+100g=300g
Cp3=50g*100%/300g=16%