| 4-硝基苯甲醇的低温热容和标准摩尔生成焓 |
| |
| 作者姓名： | MENG Qingfen TAN Zhicheng WANG Xiaohuan DONG Yaping LI Wu SHI Quan |
| |
| 作者单位： | Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, ;Chinese Academy of Sciences, Xining, Qinghai 810008, China ; China Ionic Liquid Laboratory and Thermochemistry Laboratory, Dalian Institute of Chemical Physics, ;Chinese Academy of Sciences, Dalian, Liaoning 116023, China ; Graduate School of the Chinese Academy of Sciences, Beijing 100049, China ; |
| |
| 摘 要： | 用精密自动绝热量热计测定了4-硝基苯甲醇（4-NBA）在78 ~ 396 K温区的摩尔热容。其熔化温度、摩尔熔化焓及摩尔熔化熵分别为:(336.426 ± 0.088) K, (20.97 ± 0.13) kJ×mol-1 和 (57.24 ± 0.36) J×K-1×mol-1.根据热力学函数关系式,从热容值计算出了该物质在80 ~ 400 K温区的热力学函数值 HT - H298.15 K] 和ST - S298.15 K]. 用精密氧弹燃烧量热计测定了该物质在T＝298.15 K的恒容燃烧能和标准摩尔燃烧焓分别为 (C7H7NO3, s)＝- ( 3549.11 ± 1.47 ) kJ×mol-1 和 (C7H7NO3, s)＝- ( 3548.49 ± 1.47 ) kJ×mol-1. 利用标准摩尔燃烧焓和其他辅助热力学数据通过盖斯热化学循环, 计算出了该物质标准摩尔生成焓 (C7H7NO3, s)＝- (206.49 ± 2.52) kJ×mol-1 .
|
| 关 键 词： | 4-硝基苯甲醇 低温热容 热力学函数 标准摩尔生成焓 |
| 收稿时间： | 2008-8-11 |
| 修稿时间： | 2009-1-24 |
Low‐tmperature Heat Capacities and Standard Molar Enthalpy of Formation of 4‐Nitrobenzyl Alcohol |
| |
| MENG Qingfen,TAN Zhicheng,WANG Xiaohuan,DONG Yaping,LI Wu,SHI Quan.Low‐tmperature Heat Capacities and Standard Molar Enthalpy of Formation of 4‐Nitrobenzyl Alcohol[J].Chinese Journal of Chemistry,2009,27(7):1225-1231. |
| |
| Authors: | Qingfen MENG Zhicheng TAN Xiaohuan WANG Yaping DONG Wu LI Quan SHI |
| |
| Institution: | 1. Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China;2. Tel.: 0086‐411‐84379199;3. Fax: 0086‐411‐84691570;4. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China;5. China Ionic Liquid Laboratory and Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China |
| |
| Abstract: | Low‐temperature heat capacities of 4‐nitrobenzyl alcohol4‐NBAhave been measured by a high precision automated adiabatic calorimeter over the temperature range from 78 to 396 K. The melting temperature, the molar enthalpy and entropy of the phase transition were determined to be (336.426±0.088) K, (20.97±0.13) kJ·mol?1 and (57.24±0.36) J·K?1·mol?1, respectively. The thermodynamic functions HT?H298.15 K] and ST?S298.15 K] were calculated in the range from 80 to 400 K at the interval of 5 K. The constant‐volume energy and standard molar enthalpy of combustion have been determined, ΔcU(C7H7NO3, s) =? (3549.11±1.47) kJ·mol?1 and ΔcHm0 (C7H7NO3, s) =? (3548.49±1.47) kJ·mol?1, by means of a precision oxygen‐bomb combustion calorimeter at T=298.15 K. The standard molar enthalpy of formation has been derived, ΔfHm0 (C7H7NO3, s) =? (206.49±2.52) kJ·mol?1, from the standard molar enthalpy of combustion in combination with other auxiliary thermodynamic quantities through a Hess thermochemical cycle. |
| |
| Keywords: | 4‐nitrobenzyl alcohol low‐temperature heat capacity thermodynamic function standard molar enthalpy of formation |
|
| 点击此处可从《中国化学》浏览原始摘要信息 |
| 点击此处可从《中国化学》下载免费的PDF全文 |
|
