In the flow diagram below, I and II represent industrial processes used in the fertiliser industry - NSC Physical Sciences - Question 10 - 2018 - Paper 2

The industrial process represented by II is the Ostwald process.

Fertiliser Y is known as ammonium nitrate and can be represented by the formula NH4NO3.

The catalyst used in the Haber process (I) is iron (Fe).

The balanced equation for the reaction of ammonia with sulfuric acid to produce ammonium sulfate is:

To calculate the NPK ratio, we need to determine the amount of nitrogen (N), phosphorus (P), and potassium (K) in the fertiliser:

1. 20 kg ammonium nitrate (NH4NO3):

   • N: 28% of 20 kg = 0.28 * 20 = 5.6 kg
   • P: 0 kg
   • K: 0 kg

2. 12 kg sodium phosphate (Na3PO4):

   • N: 0 kg
   • P: 31% of 12 kg = 0.31 * 12 = 3.72 kg
   • K: 0 kg

3. 18 kg potassium chloride (KCl):

   • N: 0 kg
   • P: 0 kg
   • K: 39% of 18 kg = 0.39 * 18 = 7.02 kg

Total N, P, K:

• Total N = 5.6 kg
• Total P = 3.72 kg
• Total K = 7.02 kg

NPK Ratio: 5.6 : 3.72 : 7.02