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ms1 = 150g*8%\100%
ms1 = 12g
ms2 = 50g*12%\100%
ms2 = 6g
6g + 12g = 18g (nowa masa substancji)
150g + 50g = 200g (nowa masa roztworu)
Cp = ms\mr*100%
Cp = 18g\200g*100%
Cp = 9%
Odp: Stężenie procentowe otrzymanego roztworu wynosi 9%.