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Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K
Zhang, Zhi-HengTan, Zhi-Cheng; Yin, Guo-Yin; Yao, Yan; Sun, Li-Xian; Li, Yan-Sheng
2007
Source PublicationJOURNAL OF CHEMICAL AND ENGINEERING DATA
ISSN0021-9568
Volume52Issue:3Pages:866-870
AbstractThe molar heat capacities of the aqueous Li2B4O7 solution at the concentration of 0.0187 mol.kg(-1) have been measured using a precision automated adiabatic calorimeter in the temperature range from 80 K to 355 K. The dependence of the molar heat capacity on temperature was given as a function of the reduced temperature X by polynomial equations C-p,C-m (J.K-1.mol(-1)) = 25.44 + 11.99X + 0.454X(2) + 1.671X(3) for the solid phase [80 K similar to 258 K, X = (T - 169)/89] and C-p,C-m (J.K-1.mol(-1)) = 77.33 for the liquid phase [274 K similar to 355 K], respectively. The phase transition of the solution was determined on the basis of the curve of the heat capacity with temperature. The temperature of the phase transition was observed at 273.04 K, and the enthalpy and entropy of the phase transition were calculated to be Delta H-m = 4.650 kJ.mol(-1) and Delta S-m = 17.03 J.K-1.mol(-1), respectively. According to the polynomial equations and thermodynamic relationship, the values of the thermodynamic function of the aqueous Li2B4O7 solution relative to 298.15 K were calculated in the temperature range from 80 K to 355 K with an interval of 5 K. The relative apparent molar heat capacities of the aqueous Li2B4O7 solution, C-p,C-phi, were calculated every 5 K in the temperature range from 80 K to 355 K from the experimental heat capacities of the aqueous Li2B4O7 solution and the heat capacities of pure water. The molar heat capacities of the aqueous Li2B4O7 solution at the concentration of 0.0187 mol.kg(-1) have been measured using a precision automated adiabatic calorimeter in the temperature range from 80 K to 355 K. The dependence of the molar heat capacity on temperature was given as a function of the reduced temperature X by polynomial equations C-p,C-m (J.K-1.mol(-1)) = 25.44 + 11.99X + 0.454X(2) + 1.671X(3) for the solid phase [80 K similar to 258 K, X = (T - 169)/89] and C-p,C-m (J.K-1.mol(-1)) = 77.33 for the liquid phase [274 K similar to 355 K], respectively. The phase transition of the solution was determined on the basis of the curve of the heat capacity with temperature. The temperature of the phase transition was observed at 273.04 K, and the enthalpy and entropy of the phase transition were calculated to be Delta H-m = 4.650 kJ.mol(-1) and Delta S-m = 17.03 J.K-1.mol(-1), respectively. According to the polynomial equations and thermodynamic relationship, the values of the thermodynamic function of the aqueous Li2B4O7 solution relative to 298.15 K were calculated in the temperature range from 80 K to 355 K with an interval of 5 K. The relative apparent molar heat capacities of the aqueous Li2B4O7 solution, C-p,C-phi, were calculated every 5 K in the temperature range from 80 K to 355 K from the experimental heat capacities of the aqueous Li2B4O7 solution and the heat capacities of pure water.
Other Abstract英文摘要
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/2289
Collection青海盐湖研究所知识仓储
Recommended Citation
GB/T 7714
Zhang, Zhi-HengTan, Zhi-Cheng,Yin, Guo-Yin,Yao, Yan,et al. Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K[J]. JOURNAL OF CHEMICAL AND ENGINEERING DATA,2007,52(3):866-870.
APA Zhang, Zhi-HengTan, Zhi-Cheng,Yin, Guo-Yin,Yao, Yan,Sun, Li-Xian,&Li, Yan-Sheng.(2007).Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K.JOURNAL OF CHEMICAL AND ENGINEERING DATA,52(3),866-870.
MLA Zhang, Zhi-HengTan, Zhi-Cheng,et al."Heat capacities and thermodynamic functions of the aqueous Li2B4O7solution in the temperature range from 80 K to 355 K".JOURNAL OF CHEMICAL AND ENGINEERING DATA 52.3(2007):866-870.
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