A) 0.67
B) 0.80
C) 0.50
D) 2.2
Correct Answer: A
Solution :
[a] Mixture boils at 1 atm and 350 K Thus, total vapour pressure is 1 atm =760 torr (h) used for hexane and (ch) for cyclohexane. \[{{p}_{total}}={{p}_{h}}^{0}{{\chi }_{h}}^{0}+{{p}_{ch}}^{0}{{\chi }_{ch}}\Rightarrow {{p}_{total}}\] \[={{p}_{h}}^{0}{{\chi }_{h}}+{{p}_{ch}}^{0}(1-{{\chi }_{h}})\] \[760=840{{\chi }_{h}}+600(1-{{\chi }_{h}})\] \[\therefore {{\chi }_{h}}=0.67\]
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