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Title: | Thermochemistry of the compounds M(C₄H7O5)x.nH2O(s) (x = 1 and 2, n = 1 and 0) of several kinds of biologically active metal ions (M = Na, K, Mg and Ca) with L-threonic acid |
Authors: | Di, You-Ying Gao, Sheng-Li Chen, San-Ping |
Issue Date: | Jan-2008 |
Publisher: | CSIR |
Abstract: | The constant-volume energies of combustion (ΔCU ) of the solid hydrated L-threonate, M(C₄H₇O₅)xΔnH₂O(s) (M = K, Na, Mg and Ca; x = 1 and 2; n = 1 and 0), have been determined to be ΔcU [Na(C₄H₇O₅)ΔH₂O, s] = –(10241.95±5.14) J g⁻¹, ΔcU [K C₄H₇O₅).H₂O, s]=–(9103.12±4.71) J g⁻¹, ΔcU [Mg(C₄H₇O₅)₂. H₂O, s] = –(10407.34±4.67) J g⁻¹ and ΔcU [Ca(C₄H₇O₅)₂.H₂O, s] = –(10097.09 ± 5.26) J g⁻¹ by an RBC-II precision rotating-bomb combustion calorimeter at 298.15 K. The standard molar enthalpies of combustion of these compounds ( ) have been calculated to be: –(1802.38±0.91), –(1748.47±0.91), –(3383.07 ± 1.21) and –(3130.65 ± 1.21) kJ•mol⁻¹. The standard molar enthalpies of formation of these compounds (ΔfHºm ) have been derived to be: –(1265.84±1.06), –(1292.59±1.06),–(2571.68±1.63) and –(2653.34±1.08) kJ•mol⁻¹ from the combination of the standard molar enthalpies of combustion of these compounds with other auxiliary thermodynamic quantities. |
Page(s): | 62-65 |
URI: | http://hdl.handle.net/123456789/551 |
ISSN: | 0376-4710 |
Appears in Collections: | IJC-A Vol.47A(01) [January 2008] |
Files in This Item:
File | Description | Size | Format | |
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IJCA 47A(1) (2008) 62-65.pdf | 119.97 kB | Adobe PDF | View/Open |
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