A deep-sea diver should breathe a gas mixture that has the same oxygen partial pressure as at

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A deep-sea diver should breathe a gas mixture that has the same oxygen partial pressure as at sea level, where dry air contains 20.9% oxygen and has a total pressure of 1.01 x 105 N/m2.

(a) What is the partial pressure of oxygen at sea level?

(b) If the diver breathes a gas mixture at a pressure of 2.00 x 106 N/m2, what percent oxygen should it be to have the same oxygen partial pressure as at sea level?

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