Example: Ammonia Production

• Consider the reaction for ammonia (NH₃) production from nitrogen and hydrogen:
• N₂(g) + 3H₂(g) → 2NH₃(g)
• To calculate the volume of ammonia produced when 400 cm³ of nitrogen reacts with excess hydrogen:
  • The balanced equation shows that one mole of nitrogen produces two moles of ammonia.
  • Since gases are at the same temperature and pressure, one mole of each gas occupies the same volume.
  • The molar ratio of nitrogen to ammonia is 1:2.
  • Thus, when 400 cm³ of nitrogen reacts, we produce double that volume of ammonia, which is 800 cm³.