Thermodynamic Properties of (NH4)2Ca [B4O5(OH)4] 2×8H2O.

Han, Wei-He; Liu, Zhihong; Zhang, Wenjuan; Zuo, Chuan-Feng; Liang, Sheng-Jun

doi:10.1002/chin.200645016

Cited by 2 publications

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“…Δ r H o (353.15 K) is measured by a heat conduction microcalorimeter which consists of a sample cell and a reference cell. This method has been described in more detail in the literature …”

Section: Resultsmentioning

confidence: 99%

“…This method has been described in more detail in the literature. 16 The temperature of this calorimetric experiment is (353.15 ( 0.01) K. The sample cell has the same volume as the reference cell (16 cm 3 ). To prevent corrosion of the stainless steel cells, two double-layer glass tubes are put in the cells, respectively.…”

Section: Heat Capacity Of Trimethyl Phosphite and 2-dimethylphosphono...mentioning

confidence: 99%

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Heat Capacity and Enthalpy of Formation of Trimethyl Phosphite, 2-Chloromethylbenzonitrile, and 2-Dimethylphosphonomethylbenzonitrile

Zeng

Xue

et al. 2007

J. Chem. Eng. Data

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The heat capacities, C p , of trimethyl phosphite, 2-dimethylphosphonomethylbenzonitrile, and 2-chloromethylbenzonitrile are measured with an adiabatic calorimeter, and the standard enthalpies of formation, ∆ f H o (298.15 K) (l or cr), for the three substances are determined. For this purpose, C p (T) values of trimethyl phosphite and 2-dimethylphosphonomethylbenzonitrile are measured in the temperature range from (298.15 to 350.32) K, and the C p (T) curves of 2-chloromethylbenzonitrile are also obtained for the crystal (300.35 to 329.00 K) and the liquid (337.26 to 372.45 K), respectively. The deviation of experimental heat capacities from the corresponding smoothed values lies within ( 1.5 %. A fusion transition phenomenon is found from the C p (T) curves of 2-chloromethylbenzonitrile, and the enthalpy of fusion is measured with a differential scanning calorimeter (DSC). The gas-phase standard enthalpies of formation, ∆ f H o (g, 298.15 K), of the three compounds are evaluated by the Benson group additive method. The critical temperature T c , critical pressure P c , and enthalpy of vaporization ∆ vap H o of the compounds are also calculated by different group additive methods. On the basis of the above data, the values of ∆ f H o (l, 298.15 K) of trimethyl phosphate and 2-dimethylphosphonomethylbenzonitrile and of ∆ f H o -(cr, 298.15 K) of 2-chloromethylbenzonitrile are estimated. A thermochemical cycle including a chemical reaction is designed to examine the reliability of the values by measuring the heat of reaction. The result shows that the enthalpies of formation, ∆ f H o (298.15 K) (l or cr), for the three substances are acceptable.

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Section: Resultsmentioning

confidence: 99%

Section: Heat Capacity Of Trimethyl Phosphite and 2-dimethylphosphono...mentioning

confidence: 99%

Heat Capacity and Enthalpy of Formation of Trimethyl Phosphite, 2-Chloromethylbenzonitrile, and 2-Dimethylphosphonomethylbenzonitrile

Zeng

Xue

et al. 2007

J. Chem. Eng. Data

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“…Thermodynamic properties play very important roles in scientific research and industrial applications. As for the thermochemistry of alkaline-earth metal borates, the standard molar enthalpies of formation of many magnesium and calcium borates have been measured. – However, studies of the thermochemistry of the barium borates are rare. Recently, we have determined the standard molar enthalpies of formation of β-BaB 2 O 4 and BaB 2 O 4 ·4H 2 O by the method of solution calorimetry .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Thermodynamic Properties of K₂Ba[B₄O₅(OH)₄]₂·8H₂O

2008

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A new hydrated double borate, K 2 Ba[B 4 O 5 (OH) 4 ] 2 • 8H 2 O, has been synthesized and characterized by chemical analysis, elemental analysis, X-ray diffraction, infrared spectrum, and thermogravimetric analysis. The molar enthalpies of solution of K 2 Ba [B 4 O 5 (OH) 4 ] 2 • 8H 2 O in 1 mol • dm -3 HCl(aq) and of KCl(s) in [Ba(OH) 2 • 8H 2 O(aq) + H 3 BO 3 (aq) + HCl(aq)] were measured to be (90.74 ( 0.27) kJ • mol -1 and (17.37 ( 0.31) kJ • mol -1 , respectively. With the incorporation of the previously determined enthalpy of solution of Ba(OH) 2 • 8H 2 O(s) in [HCl + H 3 BO 3 ](aq) and that of H 3 BO 3 (s) in HCl(aq), together with the standard molar enthalpies of formation of HCl(aq), H 2 O(l), Ba(OH) 2 • 8H 2 O(s), H 3 BO 3 (s), and KCl(s), the standard molar enthalpy of formation of K 2 Ba[B 4 O 5 (OH) 4 ] 2 • 8H 2 O was found to be -(10295.2 ( 6.5) kJ • mol -1 .The standard molar free energy of formation was estimated to be -9217.53 kJ • mol -1 . The standard molar entropy was estimated to be 858.1 J • mol -1 • K -1 .

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Thermodynamic Properties of (NH₄)₂Ca [B₄O₅(OH)₄] ₂×8H₂O.

Cited by 2 publications

References 1 publication

Heat Capacity and Enthalpy of Formation of Trimethyl Phosphite, 2-Chloromethylbenzonitrile, and 2-Dimethylphosphonomethylbenzonitrile

Heat Capacity and Enthalpy of Formation of Trimethyl Phosphite, 2-Chloromethylbenzonitrile, and 2-Dimethylphosphonomethylbenzonitrile

Synthesis and Thermodynamic Properties of K₂Ba[B₄O₅(OH)₄]₂·8H₂O

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Thermodynamic Properties of (NH4)2Ca [B4O5(OH)4] 2×8H2O.

Cited by 2 publications

References 1 publication

Heat Capacity and Enthalpy of Formation of Trimethyl Phosphite, 2-Chloromethylbenzonitrile, and 2-Dimethylphosphonomethylbenzonitrile

Heat Capacity and Enthalpy of Formation of Trimethyl Phosphite, 2-Chloromethylbenzonitrile, and 2-Dimethylphosphonomethylbenzonitrile

Synthesis and Thermodynamic Properties of K2Ba[B4O5(OH)4]2·8H2O

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Thermodynamic Properties of (NH₄)₂Ca [B₄O₅(OH)₄] ₂×8H₂O.

Synthesis and Thermodynamic Properties of K₂Ba[B₄O₅(OH)₄]₂·8H₂O