(Passage) of a mixture of and was treated with . of gas was evolved at STP. If reacts to give in rat — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
(Passage) $10 \text{ g}$ of a mixture of $Cu$ and $Ag$ was treated with $HNO_3$. $2.24 \text{ L}$ of $NO_2$ gas was evolved at STP. If $Cu$ reacts to give $NO_2$ in $1:2$ ratio, the percentage of $Cu$ in mixture is:
Answer: A
💡 Solution & Explanation
$\text{Moles } NO_2 = 2.24 / 22.4 = 0.1$. <br>$\text{Moles } Cu = 0.1 / 2 = 0.05$. <br>$\text{Mass } Cu = 0.05 \times 63.5 = 3.175 \text{ g}$. <br>$\% = (3.175 / 10) \times 100 = 31.75\%$.
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