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mr = 500g ms = ? (masa chlorowodoru)
Cp = 40% mw = ? (masa wody)
ms = Cp * mr / 100%
ms = 40% * 500g / 100%
ms = 200g
mw = mr - ms
mw = 500g - 200g
mw = 300g
Aby otrzymać 500g roztworu 40% nalezy uzyć 200g chlorowodoru i 300g wody