Mole fraction = pressure fraction
The mole fraction of O2 is:
At an underwater depth of 255 ft, the pressure is 8.36 atm.
You may want to reference (Pages 411 - 412) Section 10.6 while completing this problem.
What should the mole percent of oxygen be in the diving gas for the partial pressure of oxygen in the mixture to be 0.21 atm, the same as in air at 1 atm?
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