What is hydrogen enthalpy

Collection of tables chemistry / enthalpy and binding energy

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Standard enthalpy of formation of inorganic compounds (at 298 K) [edit]

In general it can be said that "pure elements" have a standard enthalpy of formation of 0.

Chemical compoundPhysical state Molecular formulaΔ Hf0 in kJ / mol
ammoniaaq NH3-80,8
ammoniaG NH3-46,1
Carbon (graphite)s C.0
Carbon (diamond)s C.+1,90
carbonG C.+718,9
Carbon monoxideG CO-110,6
carbon dioxideG CO2-393,8
carbon dioxideaq CO2-699,6
sodiums N / A2CO3-1131
Sodium chloride (table salt)aq NaCl-407
Sodium chloride (table salt)s NaCl-411,12
Sodium chloride (table salt)l NaCl-385,92
Sodium chloride (table salt)G NaCl-181,42
Sodium hydroxideaq NaOH-469,6
Sodium hydroxides NaOH-426,7
Sodium nitrateaq NaNO3-446,2
Sodium nitrates NaNO3-424,8
Sulfur dioxideG SO2-297
Carbon disulfidel CS2+87,9
Carbon disulfideG CS2+115,3
sulfuric acidl H2SO4-814
Silicon dioxides SiO2-911
Nitrogen dioxideG NO233
Nitrous oxideG N2O82
Nitric oxideG NO90
Water (material data) | waterl H2O-286
Water (material data) | waterG H2O-242
hydrogenG H20
fluorineG F.20
chlorineG Cl20
brominel Br20
bromineG Br2+31
Iodines I.20
IodineG I.2+62
(Physical states: g - gaseous (gaseous); l - liquid (liquid); s - solid (solid); aq - (dissolved in water))

Standard enthalpy of formation of organic compounds (at 298 K) [edit]

Chemical compoundPhysical state Molecular formulaΔ Hf0 in kJ / mol
methaneG CH4-75
EthaneG C.2H6-85
propaneG C.3H8-104
formaldehydeG HCHO-116
acetaldehydeG CH3CHO-166
PropionaldehydeG C.2H5CHO-197
Methanoll CH3OH-239
MethanolG CH3OH-201
Ethanol (ethyl alcohol)l C.2H5OH-278
Ethanol (ethyl alcohol)G C.2H5OH-235
n-propanol (n-propyl alcohol)l C.3H7OH-305
n-propanol (n-propyl alcohol)G C.3H7OH-258
Methanoic acid (formic acid)l HCOOH-409,5
Methanoic acid (formic acid)G HCOOH-363
Methanoic acid (formic acid)aq HCOOH-410,3
Ethanoic acid (acetic acid)l CH3COOH-487
Ethanoic acid (acetic acid)G CH3COOH-435
Propanoic acid (propionic acid)l C.2H5COOH-511
(Physical states: g - gaseous (gaseous); l - liquid (liquid); s - solid (solid); aq - (dissolved in water))

Enthalpy of evaporation

Chemical compoundBoiling temp. T Molecular formulaΔHV in kJ / mol
Methanoic acid (formic acid)+101 ° C HCOO-H22,7
Ethanoic acid (acetic acid)+118 ° C CH3COO-H39,7
Propanoic acid (propionic acid)+141 ° C C2H5COO-H52,1
Carbon monoxide-190 ° C CO6,7
Carbon dioxide-78 ° C CO223,2
Carbon disulfide+46 ° C CS228,4
hydrogen-253 ° C H20,45
methane-162 ° C CH48,9
Ethane-89 ° C C.2H615,6
propane-42 ° C C.3H819,0
ammonia-33 ° C H2N-H21,4
water+100 ° C HO-H40,7
Methanol+65 ° C CH3OH37,6
Ethanol (ethyl alcohol)+78 ° C C.2H5OH40,5
n-propanol (n-propyl alcohol)+97 ° C C.3H7OH43,6

Melting enthalpy [edit]

Chemical compoundMelting temperature Molecular formulaΔHEnamel in kJ / mol
Methanoic acid (formic acid)+8 ° C HCOOH12,7
Ethanoic acid (acetic acid)+17 ° C CH3COOH11,5
Sodium chloride800 ° C NaCl30,2
Carbon monoxide-205 ° C CO0,8
Carbon dioxide-58 ° C CO28,0
Carbon disulfide-112 ° C CS24,4
methane-183 ° C CH40,9
Ethane-183 ° C C.2H62,9
propane-182 ° C C.3H83,5
ammonia-77 ° C NH35,7
water0 ° C H2O6,0
Methanol-98 ° C CH3OH3,2
Ethanol (ethyl alcohol)-115 ° C C.2H5OH5,1
n-propanol (n-propyl alcohol)-126 ° C C.3H7OH5,2
fluorine-220 ° C F.20,4
chlorine-103 ° C Cl23,3
bromine-7 ° C Br25,3
Iodine+113 ° C I.27,7

Enthalpy of solution / enthalpy of crystallization [edit]

Chemical compoundPhysical state Molecular formulaΔ Hsolution0 in kJ / mol
Methanoic acid (formic acid)l HCOOH-33,3
Ethanoic acid (acetic acid)l CH3COOH-0,86
ammoniaG NH3-30,5
Potassium hydroxides KOH-57,1
Lithium hydroxides LiOH-23,6
Sodium hydroxides NaOH-44,5
Sodium chlorides NaCl+3,89
Sodium nitrates NaNO3+20,5

Binding energy / dissociation energy [edit]

Typical mean binding energies for covalent bonds

Single bond: 140 - 595 kJ / mol

Double bond: 420 - 710 kJ / mol

Triple bond: 810 - 1080 kJ / mol

Single bonds [edit]

Mean binding energies at 298 K in kJ / mol[1]


Multiple bonds [edit]

Source: Riedel: "Inorganic Chemistry"[1]

bindingBinding energy
C = C615
C = N616
C = O708
C = S587
N = N419
O = O498
S = O420
S = S423

  1. 1,01,1Riedel: Inorganic chemistry, 4th ed., De Gruyter; Berlin, New York 1999; ISBN 3-11-016602-X. P.119