of a mixture of and is reacted with to produce of gas at STP. The percentage of in the mixture is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
$1 \text{ g}$ of a mixture of $Al$ and $Mg$ is reacted with $HCl$ to produce $1.2 \text{ L}$ of $H_2$ gas at STP. The percentage of $Al$ in the mixture is:
Answer: B
💡 Solution & Explanation
Let mass of $Al$ be $x$. $\text{Moles } H_2 = (3/2)(x/27) + (1)(1-x)/24 = 1.2/22.4 \approx 0.0535$. Solving for $x$ gives approximately $0.4 \text{ g}$, which is 40%.
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