standard heats of formation 问题,并解释清楚。 热力学是一门研究能量转化和转移的科学。在热力学中,热力学势是描述系统状态的函数,常用的热力学势有内能、焓、自由能和吉布斯自由能。而热力学势之一的焓(enthalpy)常常与物质的热化学性质相关联。在热化学方程式中,焓的变化通常与化学反应的放热或吸热有关。为了...
1) standard heats of formation 正链烷基衍生物 1. By using the polarizability effect index,a simple method for calculating thestandard heats of formationof alkyl derivatives of main chain has been build up. 利用极化效应指数,建立了计算正链烷基衍生物同系物的标准生成热的方法,99个可比较值的平均偏差为...
Standard heats of formation of rare earth and yttrium carbonatesKarapet'yants, M KhMaier, A IBas'kova, N A
A simple method for calculating thestandard heats of formationof organic compounds containing carboxide using the inductive effect index is built up. 利用诱导效应指数建立了一个含羰基有机化合物的标准生成热的简单计算方法。 更多例句>> 5) standard molar formation of ion ...
compound: • For a gas it is a pressure of exactly 1 atm • For a substance in solution, it is a concentration of exactly1 M. • For a pure solid or liquid, it is the pure solid or liquid. Reactions showing the heats of formation: The reaction for the heat of formation of ...
Group additivity values are presented which can be used to estimate standard heats of formation for a variety of gaseous fluorocarbons, chlorofluorocarbons, hydrofluorocarbons and hydrochlorofluorocarbons (molecules, radicals, diradicals and carbenes). Wherever these values cannot be obtained directly from...
The standard heats of formation of Na2H2P2O7, Na4P2O7, (NaPO3)3 and (NaPO3)4 have been determined by solution calorimetry. The values obtained at 298°K are: ΔH°fNa2H2P2O7(c)=–664.7±1.0 kcal/mole–1; ΔH°f Na4P2O7(c)=–763.7±1.0 kcal/mole–1; ΔH°f(NaPO3...
Using the standard enthalpies of formation, of ΔH: H2O(l) = -286kJ/mol; C2H4(g) = 52.3kJ/mol; C2H5OH(l) = -278kJ/mol Calculate the standard enthalpy of reaction for : C2H4(g) + H2O(l) \rightarrow C2H5OH(l) 1. Using standard...
Re: Standard Heats Of Formation, Differs as temperature changes? « Reply #3 on: December 22, 2007, 12:35:59 PM » n-heptance, 500C -> toulene + hydrogen, 500CUsing Hess' Law, the above reaction can be resolved into 3 steps:1. n-heptance, 500C -> n-heptane, 25C2. n-hep...
An additive method for predicting the standards heats of formation at 298 K of aliphatic and alicyclic polynitro-compounds is described. It consists in three steps (i) the evaluation of the enthalpy of formation in the gaseous state (ii) the estimation of the enthalpy of vaporization for a ...