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Related Topic: Nitrogen and its Compounds

Related Subtopic: Reactions of ammonia gas



Questions 4.4.4 (a)

  1. Identify the product that accompanies nitrogen gas in the reaction.
  2. Describe the appearance of the product that accompanies nitrogen during the reaction.
  3. Write a chemical equation to represent the burning of ammonia in oxygen.
  4. State the observations made during the reaction.
  5. Determine the mass of oxygen gas required to react completely with 448 cm3 of ammonia, measured at standard states (O = 16; molar gas volume at standard states = 22.4 dm3).
  6. Suggest the function of cotton wool in this set-up.


Answers to Questions 4.4.4 (a)


  1. Water (water vapour).
  2. It appears as colourless liquid droplets on cooler parts of the glass.
  3. 4NH3(g) + 3O2(g) → 6H2O(g) + 2N2(g)
  4. A blue-green flame, and colourless liquid droplets on cooler parts of the glass tube.
  5. 4x22400 cm3 of ammonia requires 3x32 g of oxygen. Therefore 448 cm3 requires (448/22400x4) x 3x32 = 0.48 g
  6. To disperse oxygen gas uniformly around the the base of the tube.