How much potassium does potassium sulphate contain? (CG RAEO 2017)

• Potassium sulphate (K₂SO₄) is a chemical compound composed of potassium, sulfur, and oxygen. To determine the potassium content, we need to consider the atomic masses of each element:
-Potassium (K): 39 atomic mass units
-Sulfur (S): 32 atomic mass units
-Oxygen (O): 16 atomic mass units

• The molecular weight of potassium sulphate is calculated as:
(2 * 39) + 32 + (4 * 16) = 174 atomic mass units

• The proportion of potassium in potassium sulphate is:
(2 * 39) / 174 = 0.448

• Multiplying by 100 to express as a percentage:
0.448 * 100 = 44.8%
This is approximately 50%.