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
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...
Re: Standard Heats Of Formation, Differs as temperature changes? « Reply #1 on: December 15, 2007, 10:09:28 PM » Hi CocoaBear, This is a great question. Although Hess's law (http://en.wikipedia.org/wiki/Hess's_law) is only concerned with the beginning and end step, there doe...
A simple method for calculating the standard heats of formation of 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>> 3) ion standard heat of formation 离子标准生成热 1. Its ...
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 ...
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...
From the standard enthalpies of formation, calculate the \Delta H rxn for the reaction: C_6H_12(l)+9 O_2(g)6 CO_2(g)+6 H_2O(l) Given: C_6H_12(l), ? f = -151.9kJ/mol CO_2(g), ? f = -393.5kJ/mol 1. Using standard heats ...
Calculate the enthalpy of formation of SO2(g) from the standard enthalpy changes of the following reactions: 2 SO2(g)+ O2(g) -->2 SO3(g) delta H degree rxn=-196kJ 2 S(s) +3 O2(g) --> 2 SO3(g). delta Using standard heats of formation, calculate...