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Molar heat capacities and standard molar enthalpy of formation of 2-amino-5-methylpyridine
Zhang, J. N.1,4; Tan, Z. C.1,2; Meng, Q. F.3,4; Shi, Q.1,4; Tong, B.1,4; Wang, S. X.2
2009-02-01
Source PublicationJOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume95Issue:2Pages:461-467
SubtypeArticle
AbstractThe heat capacities (C (p,m)) of 2-amino-5-methylpyridine (AMP) were measured by a precision automated adiabatic calorimeter over the temperature range from 80 to 398 K. A solid-liquid phase transition was found in the range from 336 to 351 K with the peak heat capacity at 350.426 K. The melting temperature (T (m)), the molar enthalpy (Delta(fus) H (m) (0) ), and the molar entropy (Delta(fus) S (m) (0) ) of fusion were determined to be 350.431 +/- 0.018 K, 18.108 kJ mol(-1) and 51.676 J K(-1) mol(-1), respectively. The mole fraction purity of the sample used was determined to be 0.99734 through the Van't Hoff equation. The thermodynamic functions (H (T)-H (298.15) and S (T)-S (298.15)) were calculated. The molar energy of combustion and the standard molar enthalpy of combustion were determined, Delta U (c)(C(6)H(8)N(2),cr)= -3500.15 +/- 1.51 kJ mol(-1) and Delta(c) H (m) (0) (C(6)H(8)N(2),cr)= -3502.64 +/- 1.51 kJ mol(-1), by means of a precision oxygen-bomb combustion calorimeter at T=298.15 K. The standard molar enthalpy of formation of the crystalline compound was derived, Delta(r) H (m) (0) (C(6)H(8)N(2),cr)= -1.74 +/- 0.57 kJ mol(-1).
Keyword2-amino-5-methylpyridine Low-temperature Heat Capacity Standard Molar Enthalpy Of Combustion Standard Molar Enthalpy Of Formation Thermodynamic Function
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordTHERMODYNAMIC PROPERTIES ; TEMPERATURE
Indexed BySCI ; ISTP
Language英语
WOS Research AreaChemistry
WOS SubjectChemistry, Analytical ; Chemistry, Physical
WOS IDWOS:000264133800021
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Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/5890
Collection青海盐湖研究所知识仓储
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
2.Dalian Jiaotong Univ, Coll Environm Sci & Engn, Dalian 116028, Peoples R China
3.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
4.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, J. N.,Tan, Z. C.,Meng, Q. F.,et al. Molar heat capacities and standard molar enthalpy of formation of 2-amino-5-methylpyridine[J]. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,2009,95(2):461-467.
APA Zhang, J. N.,Tan, Z. C.,Meng, Q. F.,Shi, Q.,Tong, B.,&Wang, S. X..(2009).Molar heat capacities and standard molar enthalpy of formation of 2-amino-5-methylpyridine.JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,95(2),461-467.
MLA Zhang, J. N.,et al."Molar heat capacities and standard molar enthalpy of formation of 2-amino-5-methylpyridine".JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 95.2(2009):461-467.
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