4. (5) A self-contained underwater breathing apparatus uses canisters containing potassium superoxide. The superoxide consumes the carbon dioxide exhaled by a person and replaces it with oxygen. 4 KO2 (s) + 2 CO2 (g) 2 K2CO3 (s) + 3O2 (g) What mass of potassium superoxide is required to react with 8.90 L of carbon dioxide at 22.0 °C and 767 mm Hg?