The total lung capacity of a typical adult is 5.0 L .Approximately, 20 % of the air is oxygen. At sea level and at a body temperature of 37°C . How many oxygen molecules do the lungs contain at the end of a strong inhalation?

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Chapter 18, Problem 23EAP

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The total lung capacity of a typical adult is 5.0 L .Approximately, 20 % of the air is oxygen. At sea level and at a body temperature of 37°C . How many oxygen molecules do the lungs contain at the end of a strong inhalation?

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How is it that part a is connected to part b? I can't seem to solve either part and don't see the connection between the two.