Oblicz ile gramów substancji należy rozpuścić w 360g wody, aby otrzymać roztwór 20-procentowy
mw=360g
Cp=20%
ms=?
Cp=ms/(ms+mw) * 100%
20%=ms/(ms+360g) * 100% /*ms+360g
20ms+7200g=100ms
80ms=7200g /:80
ms=90g
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mw=360g
Cp=20%
ms=?
Cp=ms/(ms+mw) * 100%
20%=ms/(ms+360g) * 100% /*ms+360g
20ms+7200g=100ms
80ms=7200g /:80
ms=90g