Thermodynamic properties of zirconium chlorides I. The standard molar enthalpy of formation, the low-temperature heat capacity, the standard molar entropy, and the standard molar Gibbs energy of formation of zirconium trichloride
作者:M.E Efimov、I.V Prokopenko、V.I Tsirelnikov、S.I Troyanov、V.A Medvedev、G.A Berezovskii、I.E Paukov
DOI:10.1016/0021-9614(87)90117-0
日期:1987.4
measurements between 7 and 312 K were performed on a pure sample of ZrCl3(cr). The following standard molar thermodynamic quantities are reported at T∘ = 298.15 K: the heat capacity: Cp, m∘(T∘) = (92.871 ± 0.089) J · K−1 · mol−1; the entropy: Sm∘(T∘) = (137.50 ± 0.28) J · K−1 · mol−1; the enthalpy increment: Hm∘(T∘) − m∘(0)} = (19239 ± 29) J · mol−1; and the Gibbs energy of formation: ΔfGm∘(T∘) = −(685
ZrCl3(cr) 和 ZrCl4(cr) 与 3 mol·dm-3 HCl 溶液的反应焓在 isoperibol 量热计 LKB-8700 的 0.1 dm3 反应容器中测量。所得反应的焓变:ZrCl3(cr)+HCl(sln,17.06H2O) = ZrCl4(cr)+0.5H2(g),发现为 ΔrHm∘(298.15 K) = -(62.6 ± 2.7) kJ · mol−1 导致 ΔfHm∘(ZrCl3, cr, 298.15 K) = -(753.9 ± 3.0) kJ · mol−1。在 7 到 312 K 之间的热容量测量是对 ZrCl3(cr) 的纯样品进行的。以下标准摩尔热力学量在 T∘ = 298.15 K 时报告: 热容:Cp, m∘(T∘) = (92.871 ± 0.089) J·K-1·mol-1;熵:Sm∘(T∘) = (137.50 ± 0.28) J·K-