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Answer to Question #42484 in Physical Chemistry for ashley

Question #42484
A solution is composed of one mole of non-volatile solute and four moles of volatile solvent. If the vapor pressure of the pure solvent is 20 torr, what is the vapor pressure of the solution?
Expert's answer
The solute is non-volatile, so the vapor pressure will be equal to the pressure of the solvent.
According to Raoult's law:
Pi = xiPoi
where xi is a mole fraction, Poi is the pressure of pure substance.
Calculate the mole fraction of the solvent:
x(solvent) = n(solvent)/[n(solvent) + n(solute)] = 4/5 = 0.8
P(solvent) = 0.8*20 = 16 torr
Answer: P = 16 torr.

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