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mr (masa roztworu) : 200 g
Cp (stężenie procentowe) : 30 %
Szukane :
ms (masa substancji) : ?
Cp = ms*100 % / mr
ms*100% = Cp*mr / : 100%
ms= Cp*mr/ 100 %
ms = 30 % * 200g / 100 % [procenty skracasz i zostaje gram]
ms = 60 g