
Concept explainers
Interpretation:
The number of ozone molecules in the stratosphere and their mass in kg are to becalculated.
Concept introduction:
Stratosphere is the second layer of the Earth’s atmosphere and contains oxygen, ozone,and nitrogen gases.
Ozone is an allotrope of oxygen, containing three oxygen atoms. Ozone is formed in the stratosphere.

Answer to Problem 21QP
Solution: The number of ozone molecule is
Explanation of Solution
Given information: The quantity of ozone in the stratosphere is equivalent to a
The number of ozone molecules in the stratosphere can be calculated with the help of volume.
Area of Earth surface=
=
=
The volume of ozone layer is given by the following expression:
Here,
Now substitute the values in the above equation as shown below:
Therefore, the volume of thesphereis
The number of moles of ozone
Moles of
At standard temperature and pressure (STP), one mole of gas occupies
By substituting the values in the above equation:
Moles of
Moles of
Therefore, the number of moles of
The molecule of ozone
A molecule of
By substituting the values in the above equation:
Molecule of
Molecule of
Therefore, the number ofozonemolecules is
The mass of ozone
Mass of
Mass of
Mass of
The number of ozone molecules in the stratosphere and their mass in kg are
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Chapter 21 Solutions
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