Answer to Question #42484 in Physical Chemistry for ashley
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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