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r- <br /> TABLE 5 PERCENT COMPOSITIONS AND PHYSICAL PROPERTIES OF <br /> MAJOR GASOLINE CONSTITUENTS <br /> Physical Pro ertiesb <br /> Percentage Water <br /> in Gasoline Vapor Pressure Solubility <br /> Constituent by Weighta at 20 C (mm Hg) at 20 C (m L) <br /> Alkanes 26-79 <br /> n-butane 3.93-4 . 70 1 ,823 ( 25 C ) 61 <br /> n-pentane 5.75-10 .92 430 9.8 <br /> n-hexane 0.24-3. 50 120 755 <br /> n-heptane 0. 31 -1 .96 35 3 <br /> n--octane 0. 36-1 .43 11 0 .66 <br /> isopentane 6.07-10 . 17 560 48 <br /> 2-methylpentane 2 .91-3. 85 400 (42 C) -- <br /> Alkenes 3-6 <br /> 2-pentene 0 . 52-0. 90 380 203 <br /> 2-methyl-2-butene 0.96-1 . 28 190 78 <br /> Cycloalkanes < 1 <br /> Cyclopentane 0. 19-0. 58 400 1.51 <br /> Aromatics 11-55 <br /> Benzene 0. 12-3. 50 76 1 , 780 <br /> Toluene 2.73-21 .80 22 515 <br /> f Xylene 3.22-8. 31 6 175 <br /> a. from SWRCB 1987 . <br /> b. from Verschueren 1983, or estimated by techniques in Lyman et <br /> al. 1982. <br /> Note: -- indicates datum not available. <br />