(JEE Main 2022) of a mixture of and contains by mass. The number of moles of is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
(JEE Main 2022) $10 \text{ g}$ of a mixture of $Cu$ and $Cu_2O$ contains $90\% \text{ } Cu$ by mass. The number of moles of $Cu_2O$ is:
Answer: A
💡 Solution & Explanation
$\text{Mass } Cu_2O = 10 \times 0.1 = 1 \text{ g}$. <br>$\text{MW } Cu_2O = 2(63.5) + 16 = 143 \text{ g/mol}$. <br>$\text{Moles} = 1 / 143 \approx 0.00699 \approx 0.007 \text{ mol}$.
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