Question
Chemistry Question on Structure of atom
At a certain temperature, the vapour pressures of benzene and toluene are 119 torr and 37 torr, respectively. The mole fraction of toluene in the vapour phase, which is in equilibrium with a solution of benzene and toluene in 1 : 1 molar ratio, is
A
(A) 0.237
B
(B) 0.5
C
(C) 0.763
D
(D) None of these
Answer
(A) 0.237
Explanation
Solution
Explanation:
Assuming ideal behaviour,Pbenzene =Xbenzene Pben sene o=0.5×119 torr =59.5 torrPtoluene =Xtoluene Ptod 0=0.5×37 torr =18.5 torrPtotal =59.5+18.5=78.0 torrxtolvap=Ptoluene/Ptotal=18.5/78.0=0.237Thus,(1) is the correct option.