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A young male adult takes in about 5.69 x 10-4 m3 of fresh air during a...

A young male adult takes in about 5.69 x 10-4 m3 of fresh air during a normal breath. Fresh air contains approximately 21% oxygen. Assuming that the pressure in the lungs is 1.06 x 105 Pa and air is an ideal gas at a temperature of 310 K, find the number of oxygen molecules in a normal breath.

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