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

Question

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

Prashant Kotian · Accepted Answer

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

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