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15 January, 17:44

If this reaction produced 19.6 g of kcl, how much o2 was produced (in grams) ?

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  1. 15 January, 18:38
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    Answer is: mass of oxygen is 12,576 grams.

    Missing chemical reaction: 2KClO₃ → 2KCl + 3O₂.

    m (KCl) = 19,6 g.

    n (KCl) = m (KCl) : M (KCl).

    n (KCl) = 19,6 g : 74,55 g/mol.

    n (KCl) = 0,262 mol.

    From chemical reaction: n (KCl) : n (O₂) = 2 : 3.

    n (O₂) = 3 · 0,262 mol : 2.

    n (O₂) = 0,393 mol.

    m (O₂) = n (O₂) · M (O₂).

    m (O₂) = 0,393 mol · 32 g/mol.

    m (O₂) = 12,576 g.
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