The energy of formation of neodymium trifluoride was measured by direct fluorination of neodymium metal in a bomb calorimeter. From the experimental results the following values were determined: the standard enthalpy of formation ΔH f o(NdF 3, c, 298.15 K) = (1660.6 ± 4.9) kJ mol 1, and...
The enthalpy of formation of the metasilicate hydrate Na2SiO3.5H2O referred to the anhydrous silicate and water was determined by solution calorimetry at 298.2 K : −59.3 ± 3.0 kJ/mol. Some considerations on the thermochemistry of hydrates are proposed.[Copyright &y& Elsevier]年份: 2002...
With a fully automated high temperature calorimeter the enthalpy of formation of the [Pt-Sn] liquid system was determined on the molar fraction range 0<x<0.72 (with x=x) between 870 K<T<1660 K. Referring to the liquid constituents [H], the molar enthalpy of mixing of the [Pt-Sn] liq...
Calculate the standard molar enthalpy of formation for $$ N _ { 2 } O _ { 5 } $$e(g) from the following date:$$ 2 N O ( g ) + O _ { 2 } ( g ) = 2 N O _ { 2 } ( g ) \Delta _ { r } H _ { m } ^ { \textcircled { = } } ( 1 ) = - 1 1 4 ....
heat of formation (redirected fromStandard enthalpy change of formation) Thesaurus Medical Encyclopedia Wikipedia n (Chemistry)chemthe heat evolved or absorbed when one mole of a compound is formed from its constituent atoms Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © ...
The water melting enthalpy occurring at each of the isotherm steps is used to calculate the portion of water retained in the pore of a calculated diameter range. For this experiment, in vitro poplar saplings were sampled as follows: 3 cm from the basal part of the stems were dissected ...
Since the enthalpy of formation for A-site vacancies in perovskites strongly influences the formation of SCRs, one can hypothesize that the chemical nature of the A-site ions strongly influences the exsolution of B-site dopants. Specifically, the well-documented enhancement of exsolution phenomena by...
High-temperature direct reaction calorimetry has been used to determine the standard enthalpy of formation of several Al-Ni-Ti alloys. The stability of the L2 1 structure over the B2 structure at the stoichiometric composition of Ni 0.5 Al 0.25 Ti 0.25 was estimated from the enthalpy results to...
Our calculations also identify that the literature enthalpy of formation of crotonaldehyde is in error by as much as 1 kcal mol-1, and we suggest a value of −25.1 kcal mol-1, which we calculate using isodesmic work reactions. Bond energies for each of the bonds in the aldehydes up to...
F. Use of the van’t Hoff relation in determination of the enthalpy of micelle formation. J. Phys. Chem. 78, 1442–1443 (1974). Article CAS Google Scholar Download references Acknowledgements We thank Y. Xia for help with the NMR experiments. We are grateful to F. Dar, A. Holehouse...