2Na (s) + 2 H2O (l) → 2NaOH (aq) + H2 (g) If 4.52 moles of Na react with an excess of water, how many grams of H2 are formed?
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2017-12-18 4:44 am
✔ 最佳答案
2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)Mole ratio Na : H₂ = 2 : 1
No. of moles of H₂ formed = (4.52 mol) × (1/2) = 2.26 mol
Molar mass of H₂ = 1.0 × 2 g/mol = 2.0 g/mol
Mass of H₂ formed = (2.26 mol) × (2.0 g/mol) = 4.52 g
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