You entered a contest to see who can hold their breath the longest, and the winner gets $5,000. The host of the contest offers you some "hyperoxic" gas to breath and says it will help you hold your breath longer. Being the great exercise physiologist that you are, you notice that the gas canister says 50% O2 and 7% CO2. Should you breathe this gas? EXPLAIN YOUR REASONING (hint; think about partial pressures of both gases.