A sample of gave of on heating. Calculate the percentage purity of the sample. — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
A $10 \text{ g}$ sample of $KClO_3$ gave $3.2 \text{ g}$ of $O_2$ on heating. Calculate the percentage purity of the sample.
Answer: $81.7\%$
💡 Solution & Explanation
$2KClO_3 \rightarrow 2KCl + 3O_2$. <br>$\text{moles } O_2 = 3.2 / 32 = 0.1 \text{ mol}$. <br>$\text{moles } KClO_3 \text{ required} = 0.1 \times (2/3) = 0.0667$. <br>$\text{Mass pure} = 0.0667 \times 122.5 = 8.17 \text{ g}$. <br>$\% = 8.17 / 10 \times 100 = 81.7\%$.
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