of an impure sample of (At. wt. ) is heated to give . What is the percentage purity of the sample? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
$10 \text{ g}$ of an impure sample of $MgCO_3$ (At. wt. $Mg=24, C=12, O=16$) is heated to give $0.1 \text{ mole of } CO_2$. What is the percentage purity of the sample?
Answer: 84
💡 Solution & Explanation
$\text{Moles of pure } MgCO_3 = \text{moles of } CO_2 = 0.1\text{ mol}$. <br>$\text{Mass of pure } MgCO_3 = 0.1 \times (24+12+48) = 8.4\text{ g}$. <br>$\text{Percentage purity} = (8.4 / 10) \times 100 = 84\%$.
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