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Helium is mixed with the oxygen gas for deep sea divers. The percent by volume of oxygen gas in the mixture of the diver has to submerge to a depth where the total pressure is 4.2 atm and partial pressure of oxygen is maintained at 0.2 atm at this depth is ___________.
Correct Answer: 4.76
For ideal gases the volume fraction equals the mole fraction, which equals the partial pressure divided by the total pressure. So the percentage of oxygen by volume is $$\frac{0.2}{4.2} \times 100 \approx 4.76\%$$.
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