Potassium superoxide, KO2, is utilised in closed system breathing apparatus. Exhaled air contains CO2 and H2O both of which are removed and the removal of water generates oxygen for breathing by the reaction: 4KO2(s)+2H2O(l)→3O2(g)+4KOH(s). The potassium hydroxide removes CO2 from the appratus by the reaction: KOHsw+CO2(g)→KHCO3(s).
The mass of
KO2 generating
48 g of oxygen is :