An adult takes about 12 breaths per minute, inhaling roughly 500 mL of air with each breath. The molar compositions of the inspired and expired gases are as follows: Species Inspired Gas (%) Expired Gas (%) O2 20.6 15.1 CO2 0.0 3.7 N2 77.4 75.0 H2O 2.0 6.2 The inspired gas is at 24°C and 1 atm, and the expired gas is at body temperature and pressure (37°C and 1 atm). Nitrogen is not transported into or out of the blood in the lungs. All nitrogen inhaled is exhaled. 1. Calculate the masses of O2, CO2, and H2O transferred from the pulmonary gases to the blood or vice versa (specify which) per minute. 2. Calculate the volume of air exhaled per milliliter inhaled. 3. At what rate (g/min) is this individual losing weight by merely
An adult takes about 12 breaths per minute, inhaling roughly 500 mL of air
with each breath. The molar compositions of the inspired and expired gases
are as follows:
Species Inspired Gas (%) Expired Gas (%)
O2 20.6 15.1
CO2 0.0 3.7
N2 77.4 75.0
H2O 2.0 6.2
The inspired gas is at 24°C and 1 atm, and the expired gas is at body
temperature and pressure (37°C and 1 atm). Nitrogen is not transported into
or out of the blood in the lungs. All nitrogen inhaled is exhaled.
1. Calculate the masses of O2, CO2, and H2O transferred from the
pulmonary gases to the blood or vice versa (specify which) per minute.
2. Calculate the volume of air exhaled per milliliter inhaled.
3. At what rate (g/min) is this individual losing weight by merely
breathing?
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