Practice question
Question
What is the mass of H₂O produced when 8 g of H₂ reacts with 32 g of O₂? (Atomic masses: H = 1, O = 16)
Explanation
Reaction: 2 H₂ + O₂ → 2 H₂O. Moles: H₂ = 8/2 = 4 mol, O₂ = 32/32 = 1 mol. 2 mol H₂ need 1 mol O₂; 1 mol O₂ limits, reacts with 2 mol H₂. 2 mol H₂O formed = 2 × 18 = 36 g.
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