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Stoichiometry Mass–Volume Stoichiometry

1

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Consider the reaction: Ca + 2HCl → CaCl₂ + H₂ What volume of H₂ at STP (273 K and 1 atm) is produced when 20 g Ca reacts with excess HCl?

Verified Answer & Explanation⌄

Correct Answer: B) 11.2 dm³

Concept Explanation

20 g Ca = 0.50 mol. Ca and H₂ have a 1:1 molar ratio. Therefore, H₂ = 0.50 mol. Volume = 0.50 × 22.4 = 11.2 dm³.

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