熔化与汽化:焓变和熵变

常见物质和金属在正常熔点、沸点处的相变焓,以及由 ΔS = ΔH/T 算出的相变熵。特鲁顿规则、埃林汉姆线的拐点都来自这张表。

60 行
氦He\ce{He}汽化4.220.082919.6—
氖Ne\ce{Ne}汽化27.071.7163.2—
氮NX2\ce{N2}汽化77.365.5772.0—
氩Ar\ce{Ar}汽化87.36.4373.7—
氧OX2\ce{O2}汽化90.26.8275.6—
甲烷CHX4\ce{CH4}汽化111.678.1973.3—
氪Kr\ce{Kr}汽化119.939.0875.7—
氙Xe\ce{Xe}汽化165.0512.5776.2—
硫化氢HX2S\ce{H2S}汽化213.618.6787.4—
氯ClX2\ce{Cl2}汽化239.1120.4185.4—
氨NHX3\ce{NH3}汽化239.8223.3397.3是
丙酮(CHX3)X2CO\ce{(CH3)2CO}汽化329.2229.188.4—
溴BrX2\ce{Br2}汽化331.9529.9690.3—
甲醇CHX3OH\ce{CH3OH}汽化337.835.21104.2是
正己烷CX6HX14\ce{C6H14}汽化341.8828.8584.4—
四氯化碳CClX4\ce{CCl4}汽化349.7929.8285.3—
乙醇CX2HX5OH\ce{C2H5OH}汽化351.4438.56109.7是
苯CX6HX6\ce{C6H6}汽化353.2430.7287.0—
水HX2O\ce{H2O}汽化373.1240.65109.0是
汞Hg\ce{Hg}汽化629.8859.1193.8—
氮NX2\ce{N2}熔化63.150.7111.2—
氩Ar\ce{Ar}熔化83.81.1814.1—
甲烷CHX4\ce{CH4}熔化90.690.9410.4—
乙醇CX2HX5OH\ce{C2H5OH}熔化1594.93131.0—
汞Hg\ce{Hg}熔化234.322.299.8—
水(冰)HX2O\ce{H2O}熔化273.156.0122.0是
苯CX6HX6\ce{C6H6}熔化278.689.8735.4—
钠Na\ce{Na}熔化370.872.67.0—
铝Al\ce{Al}熔化933.4710.7111.5—
氯化钠NaCl\ce{NaCl}熔化1073.828.1626.2—
铁Fe\ce{Fe}熔化181113.817.6—
锂Li\ce{Li}熔化453.6536.6—
锂Li\ce{Li}汽化1615147.191.1—
钠Na\ce{Na}汽化115697.4284.3—
镁Mg\ce{Mg}熔化9238.489.2—
镁Mg\ce{Mg}汽化1363127.493.5—
钙Ca\ce{Ca}熔化11158.547.7—
钙Ca\ce{Ca}汽化1757154.788.0—
铝Al\ce{Al}汽化2792294105.3—
硅Si\ce{Si}熔化168750.2129.8—
硅Si\ce{Si}汽化3538359101.5—
钛Ti\ce{Ti}熔化194114.157.3—
钛Ti\ce{Ti}汽化3560425119.4—
铬Cr\ce{Cr}熔化2180219.6—
铬Cr\ce{Cr}汽化2944339.5115.3—
锰Mn\ce{Mn}熔化151912.918.5—
锰Mn\ce{Mn}汽化233422194.7—
铁Fe\ce{Fe}汽化3134349.6111.5—
镍Ni\ce{Ni}熔化172817.4810.1—
镍Ni\ce{Ni}汽化3186377.5118.5—
铜Cu\ce{Cu}熔化1357.7713.269.8—
铜Cu\ce{Cu}汽化2835300.4106.0—
锌Zn\ce{Zn}熔化692.687.06810.2—
锌Zn\ce{Zn}汽化1180115.397.7—
银Ag\ce{Ag}熔化1234.9311.289.1—
银Ag\ce{Ag}汽化2435254.1104.3—
锡Sn\ce{Sn}熔化505.087.17314.2—
锡Sn\ce{Sn}汽化2875296.1103.0—
铅Pb\ce{Pb}熔化600.614.7748.0—
铅Pb\ce{Pb}汽化2022179.588.8—

正常沸点、熔点指 1 atm 下的相变温度;焓变为该温度下的数值。多数非缔合液体的汽化熵约 85 J/(K·mol)(特鲁顿规则),水、醇、氨等氢键液体明显更大。

数据来源

  1. W. M. Haynes (ed.), CRC Handbook of Chemistry and Physics, 97th ed. (2016), “Enthalpy of vaporization”, “Enthalpy of fusion”, and the physical constants of the elements.

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