of a divalent metal on reaction with acid gave of gas at STP. The atomic mass of the metal is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
$1.5 \text{ g}$ of a divalent metal on reaction with acid gave $560 \text{ mL}$ of $H_2$ gas at STP. The atomic mass of the metal is:
Answer: A
💡 Solution & Explanation
$M + 2H^+ \rightarrow M^{2+} + H_2$. <br>$\text{Moles } H_2 = 560 / 22400 = 0.025$. <br>$\text{Moles of Metal} = 0.025$. <br>$\text{At. mass} = 1.5 / 0.025 = 60$.
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