Heats Of Formation Chart

Nai s sodium iodide 68 84.

Heats of formation chart. Standard enthalpy of formation for various compounds compound δh f kj mol compound δh f kj mol compound δh f kj mol compound δh f kj mol ag 2o s 30 6 c 2h 5oh l 277 6 hcl g 92 3 nh 4cl s 315 4 ag 2s s 31 8 c 2h 6 g 84 7 hf g 268 6 nh 4no 3 s 365 1 agbr s 99 5 c 3h 8 g 103 8 hgo s 90 7 nio s 244 3. C 2 h 5 oh l 276 98. The molar heat of formation or standard enthalpy of formation is the change in enthalpy when 1 mole of a substance is formed from its elements under standard state conditions the standard enthalpy change of formation is the sum of the heats of formation of the products of a reaction minus the sum of the heats of formation of the reactants.

Br 2 g 30 91. You need to know the values of the heat of formation to calculate enthalpy as well as for other thermochemistry problems. The standard heat of formation is the enthalpy change associated with the formation of one mole of a compound from its elements in their standard states.

Substance kj mol substance kj mol al 2 o 3 s 1669 8. For tabulation purposes standard formation enthalpies are all given at a single temperature. These tables include heat of formation data gathered from a variety of sources including the primary and secondary literature as well as the nist chemistry webbook.

No 2 g 33 85. Heats of formation of compounds at 298k from elements in their standard states. 298 k represented by the symbol δ fh.

Standard heats of formation of selected substances. Standand enthalpies of formation standard entropies of common compounds substance state h f s kj mol j mol k ag s 0 42 6 ag aq 105 79 72 7 agcl s 127 01 96 2 agbr s 100 4 107 1 agno 3 s 124 4 140 9 al s 0 28 3 al 3 aq 538 4 321 7 alcl 3 s 704 110 7 al 2o 3 s 1675 7 50 9 ba s 0 62 8 bacl 2 s 858 6 123 7 baco 3. C s diamond 1 90.

O 3 g 142 2. D h o 298 kcal mol 1 h aq proton. H 2 o 2 l 187 6.

The standard conditions for thermochemistry are 25 c and 101 3 kpa. Note that the table for alkanes contains δ f h o values in kcal mol 1 kcal mol 4 184 kj mol and the table for miscellaneous compounds and elements contains these values in kj mol. C s graphite 0.

Also called standard enthalpy of formation the molar heat of formation of a compound δh f is equal to its enthalpy change δh when one mole of a compound is formed at 25 degrees celsius and one atom from elements in their stable form. Standard heats and free energies of formation and absolute entropies of elements and inorganic compounds.