
Concept explainers
Interpretation: The number of ozone molecules present and the mass of ozone molecules should be determined.
Concept Introduction:
Atmosphere: The atmosphere is defined as air that is layer of gases which surrounds the earth due to gravity of earth.
The earth atmosphere consists of layers such as thermosphere, mesosphere, stratosphere and troposphere depending on the temperature and its composition.
Stratosphere:
It is found below the mesosphere layer in which the concentration of ozone and other gases are high. The increasing temperature for this layer with respect to increasing height is due to the presence of high concentration of ozone and other gases in it.
The increased temperature is due to the response of UV radiation from sun and hence ozone is formed due to this reaction and the use of ozone is that it prevents the UV radiation from the sun which is actually harmful.
Balanced Equation: A
Moles: It is the number of particles present in the given specific substance. The formula used to identify the moles present in given mass of a compound is as follows,
Molar mass: It is the total mass of the substance including all the number and the mass of the elements present in substance.

Answer to Problem 21.21QP
The number of ozone molecules present in the stratosphere is.
The mass of ozone is
To determine: The number of ozone molecules and the mass of the molecules present using given data’s.
Explanation of Solution
Determine the total volume.
In order to find the number of molecules one needs to find the moles and to determine the moles present in the stratosphere we need to know the total volume present hence volume is obtained by substituting the given radius and thickness data in volume of sphere formula since earth considered as sphere.
Determine the molecules.
First, the moles present is determined by dividing the volume of ozone present with the
The next step is to find the number of molecules which is accomplished by multiplying the number of moles present with
Determine the mass of the ozone molecules.
The mass of ozone molecules present is determined by using the given moles formula where the moles of ozone and the molar mass of ozone are known hence substituting it gives the mass of the ozone which is converted into kilograms by multiplying with
Conclusion
The number of molecules and the mass present is determined by using the moles formula.
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Chapter 21 Solutions
Chemistry: Atoms First
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