Which of the following statements about the composition of the vapour over an ideal molar liquid mixture of benzene () and toluene () is correct at ?

Question

Which of the following statements about the composition of the vapour over an ideal $1:1$ molar liquid mixture of benzene ($P^0 = 12.8	ext{ kPa}$) and toluene ($P^0 = 3.85	ext{ kPa}$) is correct at $25^\circ	ext{C}$?

Prashant Kotian · Accepted Answer

Correct answer: C. By Konowaloff's rule, the vapour phase in equilibrium with an ideal solution is always richer in the more volatile component. Since benzene has a higher pure vapour pressure (), it is more volatile, and thus .

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