What is the dew point of a vapor that is \(30.0 \mathrm{~mol} \% \mathrm{n}\)-butane, \(50.0 \mathrm{~mol} \% \mathrm{n}\) pentane, and \(20.0 \mathrm{~mol} \% \mathrm{n}\)-hexane at \(\mathrm{p}=760.0 \mathrm{~mm} \mathrm{Hg}\) ? Use Raoult's law to predict K values. Find vapor pressures from Antoine's Eq. (2-11) and Antoine constants from Table 2-3.

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TABLE 2-3. Constants for Antoine Eq. (2-9) Data from Various Sources (VP in mm Hg; T in C) Compound A B C Temperature Range, C Benzene 6.90565 1211.033 220.79 Benzene Toluene 6.87987 1196.76 219.161 8-80 6.95087 1342.31 219.187 -27-111 n-Butane 6.809 935.86 238.73 n-Pentane 6.853 1064.8 233.01 n-Hexane 6.876 1171.17 224.41 Acetone 7.63132 1566.69 273.419 Methanol 8.08097 1582.271 239.726 15-84 57-205 Ethanol 8.11220 1592.864 226.184 20-93 Ethanol water 8.32109 1718.10 237.52 -2-100 8.01767 1715.70 234.268 100-265 Methanol 5.20409 1581.341 -33.50 288.1-356.83 Ethanol 5.24677 1598.673 -46.424 292.77-366.63 1-Propanol 5.31384 1690.864 -51.804 292.4-370.5 Isopropanol 4.8610 1357.427 -75.814 329.92-362.41 1-Butanol 4.54607 1351.555 -93.34 295.8-391.0 2-Butanol 4.32943 1158.672 -104.683 354.54-380.30 1-Octanol 4.80915 1753.525 -99.0 328.02-387.0 Water 4.6543 1435.264 -64.848 255.9-373