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Masa substancji w tym roztworze to 40 g.
Korzystamy ze wzoru:
Cp=ms*100%/mr
Cp=40*100/300
Cp=13,3%
mw=260g
mr=ms+mw
mr=40g+260g=300g
Cp%= ms/mr * 100%
Cp%= 40g/300g*100%
Cp%= 13,3%
260g+40g=300g
Cp=40g/300g*100%
Cp= ok.13%