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13 Dec 2019

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 0.508 g/L at 25 ∘C and 721 mmHg?

Express your answer numerically as a percentage.

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Jarrod Robel
Jarrod RobelLv2
17 Dec 2019

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Related questions

± 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 ∘C 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 ∘C. The epiglottis and the vocal cords then shut, trapping the air in the lungs, where it is warmed to 37 ∘C 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.
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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 ∘C 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

.

1. A sample of gas with an initial volume of 28.2 L at a pressure of 728 mmHg and a temperature of 301 K is compressed to a volume of 14.9 L and warmed to a temperature of 375 K. What is the final pressure of the gas?

2. A gas sample with a volume of 5.3 L has a pressure of 725 mmHg at 24C. What is the pressure of the sample if the volume remains at 5.3 L but the temperature rises to 88 ∘C?

3. What is the volume occupied by 0.256 mol of helium gas at 1.20 atm and 303 K ?

4. A cylinder contains 28.5 L of oxygen gas at a pressure of 1.6 atm and a temperature of 300 K . How many moles of gas are in the cylinder?

Express your answer using two significant figures.

5. An experiment shows that a 266 mL gas sample has a mass of 0.428 g at a pressure of 765 mmHg and a temperature of 30 ∘C. What is the molar mass of the gas?

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