Oblicz ile k2o2 należu odważyć aby otrzymać 84g 10-prosentowego roztworu KOH w reakcji
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cp=ms/mr*100%
cp*mr/100%=ms
ms=10% * 84g/100%=8,4g KOH
110g K₂O₂-------------112KOH
xg K₂O₂------------8,4g KOH
x=8,25g K₂O₂