共查询到20条相似文献,搜索用时 93 毫秒
1.
用新型的具恒温环境的反应热量计 ,以 2 mol/L HCl为量热溶剂 ,分别测定了 Dy Cl3·6H2 O (s) +3Gly(s) (Gly代表甘氨酸 )和配合物 Dy(Gly) 3Cl3· 3H2 O(s)在 2 mol/L HCl溶液中的溶解焓变。根据盖斯定律设计了一个热化学循环 ,计算得到六水氯化镝与甘氨酸配位反应的反应焓Δr Hθm(2 98.2 K) =- 2 6.2 89k J/mol,并估算出配合物 Dy(Gly) 3Cl3· 3H2 O的标准生成焓 Δr Hθm(2 98.2 K) =- 3650 .5k J/mol。 相似文献
2.
采用具有恒温环境的溶解-反应量热计,以2.0mol/LHCl做溶剂,分别测定了以下反应NdCl3·6H2O(s)+4Gly(s)+Im(s)+3NaClO4(s)=[Nd(Gly)4(Im)(H2O)](ClO4)3(s)+3NaCl(s)+5H2O(1)各物质在298.15K时的溶解焓,再通过设计的热化学循环求得化学反应的标准摩尔反应焓,由以上结果和其他数据,推导出配合物[Nd(Gly)4(Im)(H2O)](ClO4)3的标准生成焓为-3456.08±0.19kJ/mol。 相似文献
3.
六水氯化钐与甘氨酸丙氨酸三元固态配合物的热化学 总被引:2,自引:0,他引:2
合成了 Sm3 +与甘氨酸丙氨酸混配体配合物 ,通过红外光谱分析、热重分析和化学分析 ,确定了配合物的组成为 :Sm( Gly) 2 ( Ala) 3 Cl3 · 2 H2 O,并用溶解量热法分别测定了 Sm Cl3 · 6H2 O( s) ,2 Gly( s) + 3Ala( s)和 Sm( Gly) 2 ( Ala) 3 Cl3 · 2 H2 O( s)在 2 mol/L HCl中的溶解焓 ;再根据盖斯定律设计了一个热化学循环 ,计算得到了六水氯化钐与甘氨酸丙氨酸反应的反应焓△ r Hθm( 2 98.1 5 K) =2 .1 60 k J/mol,并求出了 Sm( Gly) 2 ( Ala) 3 Cl3 · 2 H2 O( s)标准生成焓△f Hθm[Sm( Gly) 2 ( Ala) 3 Cl3 ·2 H2 O,s,2 98.1 5 K]=- 44 81 .5 k J/mol 相似文献
4.
用C80微热量仪测定了298.15K时斯蒂芬酸(TNR)在溶剂乙醇(EtOH)中溶解焓及热动力学行为。得到了描述该物质溶解焓(ΔsolH)的经验公式。该公式为:ΔsolH=30.108+4756.04b-616.619b1/2,并由此得到了该物质的标准摩尔溶解焓、相对表观摩尔焓、相对偏摩尔焓以及配合物的稀释焓的经验公式。溶液反应的动力学方程为:γ=-6.60613+0.5678x,由此得到了该溶解反应的速率常数及反应级数:n=0.56875;k=1.94×10-3s-1。 相似文献
5.
6.
配位化合物Cu(p-tol)2Cl2标准生成焓的测定 总被引:1,自引:0,他引:1
使用具有恒定温度环境的反应热量计,以溶解热法及针对配位反应所设计的热化学循环,得到该反应的标准反应焓△rHθm(298.15K)=-27.924 kJ·mol-1,并求得配合物Cu(p-tol)2Cl2的标准生成焓,其值推荐为△fHθm[Cu(p-tol)2Cl2,s]=-343.374 kJ·mol-1. 相似文献
7.
在298.15 K下,用氧弹热量计测定了稀土配合物RE[TsGlyH]3Cl3·nH2O(RE=La,Nd,Sm,Eu,Gd,Er)的恒容燃烧热-△cU,其结果依次为15 918.2,15 879.3,15 526.7,15 246.9,15 492.4,11 727.8 J/g。并据此计算出标准摩尔生成焓-△fHmθ分别为1 977.05,1 939.71,2 189.36,2 352.82,2 123.04,5 743.50 kJ/mol。这些结果为配合物的稳定性和热化学数据关系提供了实验依据。 相似文献
8.
在298.15 K下,用氧弹热量计测定了稀土配合物RE[TsGlyH]3Cl3·nH2O(RE=La,Nd,Sm,Eu,Gd,Er)的恒容燃烧热一△cU,其结果依次为15 918.2,15 879.3,15 526.7,15 246.9,15 492.4,11 727.8 J/g.并据此计算出标准摩尔生成焓一△fHom分别为1 977.05,1 939.71,2 189.36,2 352.82,2 123.04,5 743.50 kJ/mol.这些结果为配合物的稳定性和热化学数据关系提供了实验依据. 相似文献
9.
10.
本文针对被溶解气体在液面上具有较高分压的溶解过程介绍了一种测定气体溶解焓的方法,它是在测定了气体与定量溶液达到气液平衡的溶解焓变后,用同样温度和气体分压下的溶解度来确定气体的溶解量,从而计算出溶解焓,应用此种方法测定了二氧化碳在水中298.15K的积分溶解焓ΔH_S=-19.65±0.19kJ/molCO_2,与C.E.Vanderzee发表的数据-19.75±0.16 kJ/molCO_2相一致,还测定了CO_2(g)在碳酸丙烯酯、聚乙二醇二甲醚溶剂中最高分压为6atm时的溶解焓。 相似文献
11.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
12.
D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
13.
15.
16.
Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
17.
18.
19.
A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
20.
醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献