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Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution
Nan, ZD; Lan, XZ; Sun, LX; Tan, ZC
KeywordHeat Pipe Working Fluid Potassium Dichromate Aqueous Solution Heat Capacity Thermodynamic Function Adiabatic Calorimetry
Source PublicationINTERNATIONAL JOURNAL OF THERMAL SCIENCES
2003-07-01
DOI10.1016/S1290-0729(03)00031-0
Volume42Issue:7Pages:657-664
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectThermodynamics ; Engineering, Mechanical
WOS Research AreaThermodynamics ; Engineering
WOS KeywordHEAT-CAPACITIES ; PIPES
AbstractThe molar heat capacities (C-p,C-m) of crystalline potassium dichromate (K2Cr2O7 (cr)) and aqueous K2Cr2O7 solution (0.1699 mol(.)kg(-1)) were measured in the temperature range from 100 to 390 K and from 80 to 370 K by an automatic adiabatic calorimeter equipped with a small cell of internal volume of 6 cm(3), respectively. No phase transition took place in the temperature range from 100 to 390 K for K2Cr2O7 (cr). The relationships of C-p,C-m of K2Cr2O7 (cr) with respect to T were established to be C-p,C-m = 177.53 + 161.92X - 138.14X(2) - 209.67X(3) + 160.35X(4) + 137.44X(5) - 41.291X(6) and C-p,C-m = 177.52 + 171.66X - 149.59X(2) - 246.17X(3) + 194.79X(4) + 167.30X(5) - 64.368X(6) (X = (T - 245.00)/145.00) for Series I and Series 2 experiments, respectively. No phase transition took place for the solution from 80 to 270 K. The function of C-p,C-m of the solution with respect to T was established to be C-p,C-m = 0.137T + 2.5068 [J(.)K(-1.)mol(-1)]. A fusion transition at T-fus = 272.19 K was found from the C-p,C-m-T curve of the solution. The molar enthalpy and entropy of the phase transition were calculated to be 6.115 kJ(.)mol(-1) and 22.47 J(.)K(-1.)mol(-1), respectively. The molar heat capacities of the solution are about a constant in the temperature range from 275 K to 370 K, C-p,C-m =76.75 +/- 1.12 [J(.)K(-1.)mol(-1)]. The thermodynamic data of K2Cr2O7 (cr) and the solution were derived from the heat capacity data and the relationship of thermodynamic functions. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
Language英语
WOS IDWOS:000183949600003
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/138287
Collection中国科学院大连化学物理研究所
Affiliation1.Qufu Normal Univ, Dept Chem, Qufu 273165, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Nan, ZD,Lan, XZ,Sun, LX,et al. Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution[J]. INTERNATIONAL JOURNAL OF THERMAL SCIENCES,2003,42(7):657-664.
APA Nan, ZD,Lan, XZ,Sun, LX,&Tan, ZC.(2003).Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution.INTERNATIONAL JOURNAL OF THERMAL SCIENCES,42(7),657-664.
MLA Nan, ZD,et al."Thermodynamic investigation of crystalline K2Cr2O7 and aqueous K2Cr2O7 solution".INTERNATIONAL JOURNAL OF THERMAL SCIENCES 42.7(2003):657-664.
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