
Concept explainers
(a)
Interpretation:
The work done needed to increase the surface area of a pool of chloroform by
Concept introduction:
The atoms or molecules at the surface of the liquid are considered as a film. The atoms or molecules in bulk imply a force on the atoms or molecules at the surface of the liquid and tends to minimize the surface area of the liquid. This phenomenon is known as the surface tension of the liquid.

Answer to Problem 22.5E
The work done required to increase the surface area of a pool of chloroform by
Explanation of Solution
The work done to increase the surface area is calculated by the formula shown below.
Where,
•
•
The conversion of
Therefore, conversion of
The value of
Substitute the values of
The conversion of
Therefore,
The work done to increase the surface area of pool of chloroform by
(b)
Interpretation:
The work done to make the film of chloroform having area of
Concept introduction:
The atoms or molecules at the surface of the liquid are considered as a film. The atoms or molecules in bulk imply a force on the atoms or molecules at the surface of the liquid and tends to minimize the surface area of the liquid. This phenomenon is known as the surface tension of the liquid.

Answer to Problem 22.5E
The work done to make the film of chloroform having area of
Explanation of Solution
The making of film is same as increasing the surface area of a liquid. Therefore, the work done to make the film of chloroform is calculated by the formula given below.
Where,
•
•
The conversion of
Therefore, the conversion of
The conversion of
Therefore, the conversion of
The value of
Substitute the values of
The conversion of
Therefore,
The work done to make the film of chloroform having area of
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Chapter 22 Solutions
Physical Chemistry
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