
Concept explainers
Interpretation:
The partial pressures of the components A and B, above the condensed liquid at
Concept introduction:
The moles are calculated as follows:
Mole fraction can be expressed as follows:
The partial pressure of the components can be calculated using the expression as follows:
Here,
The relation of vapour and the condensed state will be as follows:

Answer to Problem 4SEPP
Solution: Option (c).
Explanation of Solution
Reasons for the correct option:
Molar mass of A is
The partial pressure of components can be found using the expression as follows:
Here,
Suppose, mass of A and mass of B as
The moles of A are calculated as follows:
The moles of B are calculated as follows:
Total no of moles in the solution arecalculated as follows:
The mole fraction of
Since, sum of mole fraction of all the components of a solution is equal to unity.
So, the mole fraction of
Now, partial pressure of A can be calculated by the expression as follows:
Similarly, the partial pressure of B can be calculated by the expression as follows:
Now, if some of the vapors are condensed at
The relation of vapour and the condensed state will be as follows:
Substituting
By substituting the partial pressure of liquid A
Hence, option (c) is correct.
Reason for incorrect options:
Option (a) is incorrect because after substituting the values, the values given in the option are not obtained.
Option (b) is incorrect because after substituting the values, the values given in the option are not obtained.
Option (d) is incorrect because after substituting the values, the values given in the option are not obtained.
Hence, options (a), (b), and (d) are incorrect.
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Chapter 13 Solutions
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