According to the chemical equation

4KO_2(s) + 2CO_2(g) ---> 2K₂CO_3(s) + 3O_2(g)

c) how many formula units of potassium carbonate are produced when six molecules of CO₂ react with excess potassium superoxide?

Answer

According to the balanced chemical equation when two molecules of carbon dioxide react 2 formula units of potassium carbonate are formed (assuming excess potassium superoxide). Carbon dioxide and potassium carbonate always combine in this ratio according to this equation. We can use this relationship as a unit conversion factor to convert between potassium superoxide and dioxygen.

This conversion between carbon dioxide and potassium carbonate tells us the six formula units of potassium carbonate are formed when six molecules of carbon dioxide react.