of a divalent metal (At. wt. 40) is reacted with excess . If of gas are evolved at STP, find the val — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
$0.1 \text{ mole}$ of a divalent metal $M$ (At. wt. 40) is reacted with excess $HCl$. If $x \text{ liters}$ of $H_2$ gas are evolved at STP, find the value of $10x/1.12$.
Answer: 20
💡 Solution & Explanation
$M + 2HCl \rightarrow MCl_2 + H_2$. <br>0.1 mole $M$ gives 0.1 mole $H_2$. <br>$\text{Vol } (x) = 0.1 \times 22.4 = 2.24 \text{ L}$. <br>$10(2.24) / 1.12 = 22.4 / 1.12 = 20$. [4, 15]
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