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Stoichiometry Mole–Volume Stoichiometry

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How many moles of Mg are required to produce 11.2 dm³ H₂ at STP (273 K and 1 atm)? Mg + 2HCl → MgCl₂ + H₂

Verified Answer & Explanation⌄

Correct Answer: C) 0.5 mol

Concept Explanation

11.2 dm³ H₂ at STP = 0.50 mol H₂. Mg : H₂ = 1 : 1. Therefore, Mg required = 0.50 mol.

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