If a liquid mixture of (n)-butanol and water that is (20.0 mathrm{~mol} % mathrm{n})-butanol is partially vaporized,

Question:

If a liquid mixture of $n$-butanol and water that is $20.0 \mathrm{~mol} \% \mathrm{n}$-butanol is partially vaporized, what is the vapor composition of the first bubble of vapor? Repeat for mixtures that are 10.0 $\mathrm{mol} \%, 30.0 \mathrm{~mol} \%$, and $40.0 \mathrm{~mol} \% \mathrm{n}$-butanol. Explain what is happening.

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