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mr1=500g
ms1=mr1*Cp1/100%
ms1=500*2/100
ms1=10g
Chcę otrzymać roztwór 5%, więc
Cp2=5%
ms2=10g
mr2=ms2*100%/Cp2
mr2=10*100/5
mr2=200g
mw=mr1-mr2
mw=500g-200g
mw = 300g wody