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13 Dec 2019

Typically, when a person coughs, he or she first inhales about 2.50 L of air at 1.00 atm and 25 âC. The epiglottis and the vocal cords then shut, trapping the air in the lungs, where it is warmed to 37 âC and compressed to a volume of about 1.70 L by the action of the diaphragm and chest muscles. The sudden opening of the epiglottis and vocal cords releases this air explosively. Just prior to this release, what is the approximate pressure of the gas inside the lungs?

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Â± Biochemical Applications of the Gas Laws

The various gas laws can be used to describe air, which is a mixture of gases. In some cases, these laws have direct application to the air that we breathe.

Part A

How long does it take a person at rest to breathe one mole of air if the person breathes 82.0 mL/s of air that is measured at 25 âC and 755 mmHg?

Express your answer numerically in seconds.

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Part B

Typically, when a person coughs, he or she first inhales about 2.00 L of air at 1.00 atm and 25 âC. The epiglottis and the vocal cords then shut, trapping the air in the lungs, where it is warmed to 37 âC and compressed to a volume of about 1.70 L by the action of the diaphragm and chest muscles. The sudden opening of the epiglottis and vocal cords releases this air explosively. Just prior to this release, what is the approximate pressure of the gas inside the lungs?

Express your answer numerically in atmospheres.

atm

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Part C

Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.518 g/L at 25 âC and 721 mmHg?

Express your answer numerically as a percentage.

%He

The various gas laws canbe used to describe air, which is a mixture of gases. In somecases, these laws have direct application to the air that webreathe.<?xml:namespace prefix = o ns ="urn:schemas-microsoft-com:office:office" />

a) How long does it take a person at rest to breatheone mole of air if the person breathes78.0<?xml:namespace prefix = v ns ="urn:schemas-microsoft-com:vml" /> ml/s of air that is measured at 25 degre celciusand 755 mmHg?

b) Typically, when a person coughs, he or she firstinhales about 2.40 L of air at 1.00atm and 25 degre celcius. The epiglottis and the vocal cords then shut,trapping the air in the lungs, where it is warmed to 37 degrecelcius and compressed to a volume of about1.70 L by the action of the diaphragm andchest muscles. The sudden opening of the epiglottis and vocal cordsreleases this air explosively. Just prior to this release, what isthe approximate pressure of the gas inside the lungs?

c) Helium-oxygen mixtures are used by divers to avoidthe bends and are used in medicine to treat some respiratoryailments. What percent (by moles) of He ispresent in a helium-oxygen mixture having a density of 0.508g/Lat 25 degre celciusand 721 mmHg

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