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masa roztworu to masa substancji ( chlorowodoru) i wody.
zatem:
C% = ?
ms = 20g
mr = 200 g
C% = (20 * 100) / 200
C% = 10 %
ms= 20g
mr= 20g+180g=200g
podstawić do wzoru
Cp=20/200*100% = 10%
Cp=10%