Potassium thiosulfate (K2S2O3) contains what percentage of K2O?

To determine the percentage of potassium oxide (K2O) in potassium thiosulfate (K2S2O3), it is essential to first understand the molecular composition of each compound involved. Potassium thiosulfate has the formula K2S2O3, which contains two potassium (K) atoms, two sulfur (S) atoms, and three oxygen (O) atoms.

The molecular weight can be calculated as follows:

• The atomic weight of potassium (K) is approximately 39.1 g/mol. Therefore, for two potassium atoms: 2 x 39.1 = 78.2 g/mol.

• The atomic weight of sulfur (S) is approximately 32.1 g/mol. For two sulfur atoms: 2 x 32.1 = 64.2 g/mol.

• The atomic weight of oxygen (O) is approximately 16.0 g/mol. For three oxygen atoms: 3 x 16.0 = 48.0 g/mol.

Adding these together provides the total molecular weight of potassium thiosulfate:

78.2 (from K) + 64.2 (from S) + 48.0 (from O) = 190.4