A) 30.5 torr and 0.389
B) 38.0 torr and 0.589
C) 35.8 torr and 0.280
D) 4 35.0 torr and 0.480
Correct Answer: C
Solution :
Total V.P. of solution \[=P_{A}^{0}{{X}_{A}}+P_{B}^{0}{{X}_{B}}\] Total V.P. of solution \[=\left( \frac{1.5}{5}\times 74.7+\frac{3.5}{5}\times 22.3 \right)torr\] \[=\left( 15.6+22.4 \right)torr\,=38torr\] Mole fraction of Benzene in vapour form \[=\frac{22.4}{38}=0.589\]
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