A) \[0.137\]
B) \[0.237\]
C) \[0.45\]
D) \[0.205\]
Correct Answer: B
Solution :
| From Raoult's law, for ideal solution, |
| \[p=p_{B}^{0}{{\chi }_{B}}+p_{T}^{0}{{\chi }_{T}}=119\times 0.5+37\times 0.5\] \[\left( \because {{\chi }_{B}}=1-{{\chi }_{T}} \right)\] |
| \[=59.5+18.5\] |
| \[=78\,\,torr\] |
| Mole fraction of toluene in vapour phase |
| \[{{\left( {{\chi }_{T}} \right)}_{\upsilon }}=\frac{p_{T}^{0}{{\chi }_{T}}}{p}=\frac{18.5}{78}=0.237\] |
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