heat of formation वाक्य

The compound is classified as " endothermic ", meaning that its heat of formation, ?H?f is positive ( 36 kJ / mol ).
Osorio said the objects she found may be smaller versions of the brown dwarf and their faint light comes only from the heat of formation.
When calculating the heat of formation, all the atoms in the molecule must be accounted for ( hydrogen atoms are not included as specific groups ).
"' Standard molar heat of formation "'of ZnBr 2 ( c, l ) from the elements, showing discontinuities at transition temperatures of the elements and the compound.
Standard state does not, strictly speaking, specify a temperature ( see standard state ), but expressions for enthalpy generally reference the standard heat of formation at 25 �C.

Using the principle of the initial and final state, and heat of formation table ( resulting from experimental data ), the heat released at constant pressure may be readily calculated.
T1 reproduces experimental heats of formation for a set of 1805 diverse organic molecules from the NIST thermochemical database with mean absolute and RMS errors of 8.5 and 11.5 kJ / mol, respectively.
Heats of formations for solids and gases found in explosive reactions have been determined for a temperature of 25 �C and atmospheric pressure, and are normally given in units of kilojoules per gram-molecule.
Atom counts, Mulliken bond orders and HF / 6-31G * and RI-MP2 energies are introduced as variables in a linear regression fit to a set of 1126 G3 ( MP2 ) heats of formation.
Note : Elements in their natural state ( H 2, O 2, N 2, C, etc . ) are used as the basis for heat of formation tables and are assigned a value of zero.