Practice question
Question
How many grams of Zn are required to produce 2.24 L of H₂ at STP with excess H₂SO₄? (Atomic mass: Zn = 65)
Explanation
Reaction: Zn + H₂SO₄ → ZnSO₄ + H₂. Moles of H₂ = 2.24/22.4 = 0.1 mol. 1 mol H₂ from 1 mol Zn; mass = 0.1 × 65 = 6.5 g.
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