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The chemical composition of air that is exhaled (expired) is different from ordinary air. A typical analysis of expired air at 37 °C and 1.00 atm, expressed as percent by volume, is 74.2% N2.15.2% O2, 3.8% CO2, 5.9% H2O, and 0.9% Ar. The composition of ordinary air is given practice Example 6-12B.
a. What is the ratio of the partial pressure of CO2(g)in expired air to that in ordinary air?
b. Would you expect the density of expired air to greater or less than that of ordinary air at the same temperature and pressure? Explain.
c. Confirm your expectation by calculating the densities of ordinary air and expired air at 37 °C and 1.00 atm.
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