Practice question
Question
A mixture of 6 g H₂ and 32 g O₂ is ignited to form H₂O. What is the mass of H₂O produced? (Atomic masses: H = 1, O = 16)
Explanation
Reaction: 2H₂ + O₂ → 2H₂O. Moles: H₂ = 6/2 = 3 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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