Question: Potassium superoxide, KO2, is employed in a selfcontained breathing apparatus used by emergency personnel as a source of oxygen. The reaction is 4KO2(s) + 2H2O(l)

Potassium superoxide, KO2, is employed in a selfcontained breathing apparatus used by emergency personnel as a source of oxygen. The reaction is
4KO2(s) + 2H2O(l) → 4KOH(s) + 3O2(g)
Say a self-contained breathing apparatus is charged with 750 g KO2 and then is used to produce 195 g of oxygen. Was all of the KO2 consumed in this reaction? If the KO2 wasn’t all consumed, how much is left over and what mass of additional O2 could be produced?

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