A) 0.33
B) 0.25
C) 0.52
D) 0.2
Correct Answer: D
Solution :
In an ideal solution of components 'A' and 'B' Mole fraction of component 'A9 in the vapour \[Phase=\frac{Partial\text{ }pressure\text{ }of\text{ }A}{Total\text{ }vapour\text{ }pressure}\] \[=\frac{{{P}_{A}}}{{{P}_{A}}+{{P}_{B}}}\] \[=\frac{P_{A}^{o}.x_{A}^{o}}{P_{A}^{o}.{{x}_{A}}+P_{B}^{o}.{{x}_{B}}}\] \[=\frac{1\times 1}{1\times 1+2\times 2}\] \[=\frac{1}{1+4}=\frac{1}{5}=0.2\]
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