Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?
Correct answer: C. Sv
- A. St
- B. 1/St
- C. Sv
- D. 1/Sv
Explanation
For an ideal solution, Raoult’s law gives the solvent partial vapour pressure as pᵥ = xᵥPᵥ°, so vapour pressure is proportional to the solvent mole fraction. It is not proportional to the solute fraction except through xᵥ = 1 − xₜ.
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