The enthalpies of combustion and formation of acetanilide and urea

Abstract

Th e e nth a lpi es of co mbu stion of ace ta nilid e a nd urea have bee n dete rmin ed in a n oxyge n·bo mb ca lo rim ete r. Th e foll ow in g val ues a nd th eir es timated un ce rt aint ies we re obtain ed. Acetan iud e UreaAHcO ( A co mpari so n with prev iou sly re port ed da ta is give n.Key word s: Co mbu s ti o n; e nthalpy; formation; he a t; seco nd a ry s tand a rd : th e rm oc hem ica l s ta nd ard.

Revision of standard molar enthalpies of formation of glycine and l-alanine in the gaseous phase on the basis of theoretical calculations

“…For glycine, the D f H m values calculated from reactions (5)-(7) are close to each other and to the G3X value (table 4). For L-alanine, the low D r H 298 value for reaction (8) indicates that this reaction is especially well-balanced. The correlation errors are canceled out nearly completely in this case, and this suggests a good accuracy for the calculated enthalpies of formation.…”

Generalized Prediction of Enthalpies of Formation Using DLPNO‐CCSD(T) Ab Initio Calculations for Molecules Containing the Elements H, C, N, O, F, S, Cl, Br

“…Thus the final fitting set includes 45 species for the elements hydrogen, carbon nitrogen, and oxygen. A further 48 species include for the inclusion of fluorine and chlorine and 13 bromine compounds .…”

A micro-combustion calorimeter suitable for samples of mass 10 mg to 50 mg. Application to solid compounds of C, H, and O, and of C, H, O, and N

“…(14) 1.21 (14) 0.12 (14) hexadecane 0.773 (15) 2.215 (15) 0.35 (16) salicylic acid 1.167 (17) 1.443 (14) 0.12 a urea 1.21 (18) 1.55 (18) 0.049 (18) a Estimated.…”