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mH₂O₂ = 34 g
34 g H₂O₂ - 32 g O₂ -22,4 dm³
85 g H₂O₂ - x g O₂ - x dm³
x=(85*32):34 = 80 g O₂ - x dm³
32 g O₂ -22,4 dm³
x=(80*22,4)=56 dm³
odp: Tlen zajmuje 56 dm³.