Question

Challenge Air is a mixture of gases. By percentage, it is roughly 78 percent nitrogen, 21 percent oxygen, and 1 percent argon. (There are trace amounts of many other gases in air. If the atmospheric pressure is 760 $\mathrm{mm}$ Hg, what are the partial pressures of nitrogen, oxygen, and argon in the atmosphere?

Name: Problem 7, Chapter 12: Chemistry Matter and Change
Uploaded: 2020-02-01T17:47:23-08:00
Duration: 51 s
Channel: Anna Miller
Description: Challenge Air is a mixture of gases. By percentage, it is roughly 78 percent nitrogen, 21 percent oxygen, and 1 percent argon. (There are trace amounts of many other gases in air. If the atmospheric pressure is 760 mm Hg, what are the partial pressures of nitrogen, oxygen, and argon in the atmosphere?

   Challenge Air is a mixture of gases. By percentage, it is roughly 78 percent nitrogen,
21 percent oxygen, and 1 percent argon. (There are trace amounts of many other gases
in air. If the atmospheric pressure is 760 $\mathrm{mm}$ Hg, what are the partial pressures of
nitrogen, oxygen, and argon in the atmosphere?

Chemistry Matter and Change

Thandi Buthelezi,… 1st Edition

Chapter 12, Problem 7

Instant Answer

Solved by Expert Anna Miller

02/01/2020

Step 1

This is done by dividing the percentage by 100. So, 78 percent becomes 0.78, 21 percent becomes 0.21, and 1 percent becomes 0.01. Show more…

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Challenge Air is a mixture of gases. By percentage, it is roughly 78 percent nitrogen, 21 percent oxygen, and 1 percent argon. (There are trace amounts of many other gases in air. If the atmospheric pressure is 760 $\mathrm{mm}$ Hg, what are the partial pressures of nitrogen, oxygen, and argon in the atmosphere?

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Key Concepts

Dalton's Law

Dalton's Law states that in a mixture of non-reacting gases, the total pressure is the sum of the partial pressures of each individual gas. This principle allows us to calculate the pressure contribution of each gas based on its proportion in the mixture.

Partial Pressure

Partial pressure is the pressure that an individual gas in a mixture would exert if it occupied the entire volume by itself at the same temperature. It is a useful concept in understanding the contribution of each gas within a mixture.

Mole Fraction and Percent Composition

The mole fraction is the ratio of the moles of a specific gas to the total moles of all gases in the mixture, and for ideal gases, it is equivalent to the volume percentage. This provides a straightforward method to determine the fraction of the total pressure that each gas contributes.

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