The following reaction is used in some self-contained breathing devices as a source of O₂(g).

Suppose that a sample of CO₂(g) is added to an evacuated flask containing KO₂(s) and equilibrium is established. If the equilibrium partial pressure of CO₂(g) is found to be 0.0721 atm, what are the equilibrium partial pressure of O₂(g) and the total gas pressure?

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4 KO2(s) + 2 CO2(g) 2 K₂CO3(s) + 3 O2(g) Kp = 28.5 at 25 °C (for pressures in atmospheres)