As the concentration of a solution increases, its vapor pressure decreases. For
ID: 1079547 • Letter: A
Question
As the concentration of a solution increases, its vapor pressure decreases. For a nonvolatile solute B in a liquid solvent A, the relationship between concentration and vapor pressure is expressed by Raoult's law:
PA=XAPA
where PA is the vapor pressure of the solution, XAis the mole fraction of solvent, and PA is the vapor pressure of the pure solvent.
In a two-component solution consisting of A and B, the mole fraction, X, of component A is defined as
XA=moles Amoles A + moles B
1. A solution is composed of 1.60 mol cyclohexane (Pcy=97.6 torr) and 2.90 molacetone (Pac=229.5 torr). What is the total vapor pressure Ptotal above this solution?
Explanation / Answer
As the concentration of a solution increases, its vapor pressure decreases. For
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