Posted by Jen on Sunday, February 6, 2011 at 11:34pm.
Calculate (you only need to know the relative difference and not exact numbers) vapor pressure of the soln and compare with the vapor pressure of the pure solvent. Which is larger? So which should evaporate faster. I should point out that this calculation gives only the values AT EQUILIBRIUM technically have nothing to do with the RATE of evaporation. However, all things being equal the material with the larger vp should evaporate faster.
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