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100%-420g
x-to masa K₂S
(Korzystam z proporcji)
x= (5%*420g):100%= 420g:20=21g
Odp:Masa K₂S w tym roztworze wynosi 21g.
O to chodziło?
Cp = 5%
mr = 420 g
Cp = ms/mr * 100 %
ms = Cp*mr/100 %
ms = 5 * 420/100
ms = 21 g
Pozdrawiam ;)