Question

When heated, KCIO3 decomposes into KCI and O2
2KCIO3 ------------- 2KCI+3O2

If this reaction produced 34.6 of KCI, how much O2 was produced in grams?

Answer 1

Answer on Question #62560 - Chemistry - Other

Task:

When heated, KClO3 decomposes into KCl and O₂:

2KClO₃ → 2KCl+3O₂.

If this reaction produced 34.6 of KCl, how much O₂ was produced in grams?

Solution:

$$n(KCl) = \frac{m(KCl)}{M(KCl)} = \frac{34.6\,g}{74.5\,g/mol} = 0.4644\,mol;$$ $$2KClO_3 \rightarrow 2KCl+3O_2$$ $$\frac{n(KCl)}{2} = \frac{n(O_2)}{3};$$ $$n(O_2) = \frac{n(KCl) \times 3}{2} = \frac{0.4644\,mol \times 3}{2} = 0.6966\,mol\,O_2;$$ $$m(O_2) = n(O_2) \times M(O_2) = 0.6966 \times 32 = 22.29\,g \approx 22.3\,g.$$ $$m(O_2) \approx 22.3\,g$$

Answer: $m(O_2) \approx 22.3\,g$

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