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Worked examples of mole-to-mole conversions. Example 1: '2H₂ + O₂ → 2H₂O. If 5 moles of H₂ react, how many moles of H₂O form?' Step 1: Write mole ratio from coefficients: 2 mol H₂ : 2 mol H₂O → ratio is 1:1. Step 2: Apply: 5 mol H₂ × (2 mol H₂O / 2 mol H₂) = 5 mol H₂O. Example 2: 'N₂ + 3H₂ → 2NH₃. I

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