Lewis describes the hazards of breathing air containing appriciable amounts of an asphyxiant (a gas that has no specific toxicity but when inhaled excludes oxygen from the lungs). When the mole percent of the asphyxiant in the air reaches 50%. marked sumptoms of distress appear and at 75% death occurs in a matter of minutes. Asmall storage room whose dimensions are 2m x 1.5 m x 3 m contains a number of expensive and dangerous chemicals. To prevent unauthorized entry, the door to the roomnis always locked and can be openedwith a key from either side. A cylinder of liquid carbon dioxide is stored in the room. The room temperature is 25 C. if the concenteration of CO₂ reaches the lethal 75 mole% level, what would be the mole percent of O₂?