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Chemistry NMDCAT MCQs Moles and Avogadro's Numbers
nmdcat.online July 2, 2026

In the reaction N₂ + 3H₂ → 2NH₃, the volume of ammonia produced at STP when 28 g of nitrogen reacts completely with excess hydrogen is

A. 11.2 dm³
B. 22.4 dm³
C. 44.8 dm³
✓
D. 67.2 dm³

📝 Explanation

Moles of N₂ = 28 ÷ 28 = 1 mole. One mole of N₂ forms 2 moles of NH₃. Volume = 2 × 22.4 = 44.8 dm³.

📖 Additional Information

  • 11.2 dm³
  • 22.4 dm³
  • 44.8 dm³
  • 67.2 dm³

Moles of N₂ = 28 ÷ 28 = 1 mole. One mole of N₂ forms 2 moles of NH₃. Volume = 2 × 22.4 = 44.8 dm³.

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