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Related Topic: Nitrogen and its Compounds

Related Subtopic: Nitrogenous fertilizers



Questions 4.4.7 (b)

  1. Write the chemical formulae of
    1. ammonium sulphate
    2. ammonium nitrate
    3. ammonium phosphate
  2. Name the acid that you would react with ammonia to produce the following fertilizers.
    1. ammonium sulphate
    2. ammonium nitrate
    3. ammonium phosphate
  3. Complete the following chemical equations to represent the manufacture of some nitrogenous fertilizers. NB: The first three are direct combination reactions, with one product only.
    1. NH3(g) + H2SO4(l)
      2. →
    2. NH3(aq) + HNO3(aq)
      3. →
    3. NH3(g) + H3PO4(aq)
      4. →
    4. NH3(aq) + CO2(g)
      5. →
  4. Calculate the percentage by mass of nitrogen in
    1. ammonium sulphate
    2. ammonium nitrate
    3. urea
    4. hence determine the fertilizer that would be priced the highest among the three. (N = 14; H = 1; S = 32; O = 16; C = 12)
  5. Nitrogen and phosphorus are both useful to plants.
    1. Determine the percentage by mass of useful elements in ammonium phosphate
    2. Which of the fertilizers ammonium phosphate and ammonium nitrate is expected to be priced higher?


Answers to Questions 4.4.7 (b)


  1. (a) (NH4)2SO4
    (b) NH4NO3
    (c) (NH4)3PO4
  2. (a) Sulphuric acid
    (b) Nitric acid
    (c) Phosphoric acid
  3. (a) 2NH3(g) + H2SO4(l) → (NH4)2SO4(s)
    (b) NH3(aq) + HNO3(aq) → NH4NO3(aq)
    (c) 3NH3(g) + H3PO4(aq) → (NH4)3PO4(aq)
    (d) 2NH3(aq) + CO2(g) → (NH2)2CO(aq) + H2O(l)
  4. (a) 17.28%
    (b) 35.0%
    (c) 46.67%
    (d) Urea
  5. (a) 30.20%
    (b) Ammonium nitrate, because it has a higher percentage of 35.0%