👤

o solutie cu concentratia 25% care contine 30 g sare are masa de cate grame ?

Răspuns :

Cp=md/ms*100==>md=Cp*ms/100=25*30/100=7.5 g sare


[tex]C-concentratie \\ Md-masa -dizolvata \\ Ms-masa-solutiei \\ c= \frac{100Md}{Ms} =\ \textgreater \ 25= \frac{100Md}{30} =\ \textgreater \ 100Md=750=\ \textgreater \ Md=7,5g\\BlackBook[/tex]