物理化学学报 >> 1989, Vol. 5 >> Issue (04): 487-491.doi: 10.3866/PKU.WHXB19890421

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二氯苯的蒸发焓和升华焓测定

安绪武; 郑晓霖   

  1. 中国科学院化学研究所
  • 收稿日期:1987-11-12 修回日期:1988-04-18 发布日期:1989-08-15
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DETERMINATION OF STANDARD ENTHALPIES OF VAPORIZATION AND SUBLIMATION OF THREE DICHLOROBENZENES

An Xuwu*; Zheng Xiaolin   

  1. Institute of Chemistry; Academia Sinica
  • Received:1987-11-12 Revised:1988-04-18 Published:1989-08-15
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Abstract: By using an LKB 8721-3 vaporization calorimeter, enthalpies of vaporization of o-and m-dichlorobenzenes and enthalpy of sublimation of p-dichlorobenzene at 298.15K were determined as 48.53±0.12, 47.40±0.08 and 65.15±0.20 kJ mol~(-1) respectively. Data of ΔH_v~° and ΔH_s~° for chlorobenzenes reported here and in literature and their normal boiling points, t_b in ℃, can fit following two linear equations: ΔH_v~° (kJ mol~(-1))=17.51+0.17269 t_b; ΔH_s~° (kJ mol~(-1))=26.25+0.22349 t_b. From these equations other unknown values of ΔH_v~°and ΔH_s~°of chlorobenzenes have been estimated.