When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of________________________?
Correct answer: A. Vapour pressure of component A to that of component B
- A. Vapour pressure of component A to that of component B
- B. Vapour pressure of component A to the total pressure
- C. Vapour pressure of component A to the partial pressure of A
- D. Partial pressure of component A to the total pressure
Explanation
For an ideal liquid and vapour, Raoult's and Dalton's laws give relative volatility as \(\alpha=P_A^{sat}/P_B^{sat}\), the ratio of the pure-component vapour pressures. It is not the ratio of a vapour pressure to a total or partial pressure.
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