oblicz ile soli i wody rozpuszono w 0,3 dm (do potegi 3) roztworu 10 procentowego o gęstości 1,059 cm (do potegi 3)
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Vr=0,3dm³=300cm³
Cp=10%
d=1,059g/cm³
d=mr/Vr /*Vr
mr=d*Vr
mr=1,059g/cm³ * 300cm³
mr=317,7g
Cp=ms/mr * 100% /*mr
Cp*mr=ms*100% /:100%
ms=Cp*mr/100%
ms=10%*317,7g/100%
ms=31,77g soli
mw=mr-ms
mw=317,7g-31,77g
mw=285,93g wody
V = 0,3dm³ = 300cm³
cp = 10%
d = 1,059g/cm³
mr = dV
mr = 300cm³ x 1,059g/cm³ = 317,7g
ms = mr x cp/100%
ms = 317,7g x 10%/100% = 31,77g
mH₂O = mr - ms
mH₂O = 317,7g - 31,77g = 285,93g
Odp. Rozpuszczono 31,77g soli i użyto 285,93g wody
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