You Try!
Potassium persulphate is a chemical used in the process of photo development. By mass,
potassium persulphate contains 28.9% potassium, 23.7% sulphur, and the remainder is oxygen.
What is the empirical formula?
Answer: KSO​4
You Try!
Find the molecular formula for a compound that has a molar mass of 99g/mole. Its %
composition is 24.2% C, 4.0% H, and 71.7% Cl.
Answer: C​2​H​4​Cl​2