a solution of sodium chloride in water has a vapor pressure of 19.5 at 25C what is the mole fraction of NaCl solute particles
To find the mole fraction of NaCl solute particles in the solution, we need to use Raoult's law, which states that the vapor pressure of a solvent above a solution is directly proportional to the mole fraction of the solvent in the solution.
The formula for Raoult's law is:
P = XA * PA
Where:
P = vapor pressure of the solution
XA = mole fraction of component A (in this case, the solvent)
PA = vapor pressure of pure component A (the solvent)
In this case, the solvent is water, and the given vapor pressure is 19.5.
Since the solvent is water, we know that the mole fraction of water (XA) is 1. The mole fraction of the solute (NaCl) can be found by subtracting the mole fraction of water from 1.
Therefore, the mole fraction of NaCl (XB) is:
XB = 1 - XA
= 1 - 1
= 0
So the mole fraction of NaCl solute particles in the solution is 0.