ATcT [1, 2] enthalpies of formation based on version 1.122d of the Thermochemical Network [3]

Below is a list of 0 K and 298.15 K enthalpies of formation for all 1414 species included in version 1.122d (as of 12/09/2015).
This version of ATcT results was generated from an expansion of version 1.122b [4][5] to include the enthalpies of formation of methylamine, dimethylamine and trimethylamine that were used as reference values to derive the bond dissociation energies of 20 diatomic molecules containing 3d transition metals.[6].

The elements in their standard states are listed first; the listing order of the other species follows the actual order from the ATcT solution file, which roughly reflects the number of thermochemically-relevant determinations that include the species in question (highest first). The intent is to convey a very approximate indication of the robustness of the listed values, which is generally higher toward the top of the list and lower toward the bottom.

For species other than elements in their standard states, the Species Name acts as a link to the page itemizing the most important contributors to the provenance of its ATcT enthalpy of formation, other highly correlated chemical species, and high-leverage reactions in the Thermochemical Network.
(Please note that, as opposed to traditional sequential thermochemistry where the provenance of a given enthalpy of formation is typically a single measurement, the provenances of ATcT enthalpies of formation, which are obtained by analysing and solving a large Thermochemical Network, are normally quite distributed.)

If you find Active Thermochemical Tables useful in your research, please cite this website as given in Ref. [3], and, if possible, the ATcT approach as given in Refs. [1] and [2].

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The reaction search accepts only the preferred formula, as specified in this version of the Thermochemical Network.
For help finding the current preferred formula of a species, please refer to the species name or species formula searches above.
For convenience clicking the preferred formula adds it to the species list for reaction searches.
The stoichiometry represents fractions as decimals,
e.g. 0.5 O2, 1 H2, 1 H2O would represent
1/2 O2 + H2 → H2O

Species Name	Image	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
Dihydrogen		0	0	exact		2.01588 ± 0.00014	1333-74-0*0
Helium		0	0	exact		4.0026020 ± 0.0000020	7440-59-7*0
Carbon atom		0	0	exact		12.01070 ± 0.00080	7440-44-0*500
Dinitrogen		0	0	exact		28.01348 ± 0.00014	7727-37-9*0
Dioxygen		0	0	exact		31.99880 ± 0.00060	7782-44-7*0
Difluorine		0	0	exact		37.9968064 ± 0.0000010	7782-41-4*0
Neon		0	0	exact		20.17970 ± 0.00060	7440-01-9*0
Dichlorine		0	0	exact		70.9054 ± 0.0018	7782-50-5*0
Argon		0	0	exact		39.94800 ± 0.00100	7440-37-1*0
Dibromine		0	0	exact		159.8080 ± 0.0020	7726-95-6*500
Krypton		0	0	exact		83.8000 ± 0.1000	7439-90-9*0
Diiodine		0	0	exact		253.808940 ± 0.000060	7553-56-2*500
Xenon		0	0	exact		131.2900 ± 0.0200	7440-63-3*0
Deuterium molecule		0	0	exact		4.02820355600 ± 0.00000000080	7782-39-0*0
Hydrogen atom		216.034	217.998	± 0.000	kJ/mol	1.007940 ± 0.000070	12385-13-6*0
Carbon atom		711.407	716.892	± 0.048	kJ/mol	12.01070 ± 0.00080	7440-44-0*0
Oxygen atom		246.844	249.229	± 0.0021	kJ/mol	15.99940 ± 0.00030	17778-80-2*0
Nitrogen atom		470.579	472.441	± 0.024	kJ/mol	14.006740 ± 0.000070	17778-88-0*0
Chlorine atom		119.621	121.302	± 0.0011	kJ/mol	35.45270 ± 0.00090	22537-15-1*0
Carbon dioxide		-393.109	-393.475	± 0.015	kJ/mol	44.00950 ± 0.00100	124-38-9*0
Fluorine atom		77.253	79.359	± 0.048	kJ/mol	18.99840320 ± 0.00000050	14762-94-8*0
Methane		-66.556	-74.525	± 0.056	kJ/mol	16.04246 ± 0.00085	74-82-8*0
Water		-286.308	-285.836	± 0.027	kJ/mol	18.01528 ± 0.00033	7732-18-5*500
Water		-238.938	-241.842	± 0.027	kJ/mol	18.01528 ± 0.00033	7732-18-5*0
Ethane		-68.33	-83.96	± 0.13	kJ/mol	30.0690 ± 0.0017	74-84-0*0
Hydron		1528.084	1530.047	± 0.000	kJ/mol	1.007391 ± 0.000070	12408-02-5*0
Bromine atom		117.917	111.855	± 0.056	kJ/mol	79.90400 ± 0.00100	10097-32-2*0
Ethylene		60.91	52.39	± 0.12	kJ/mol	28.0532 ± 0.0016	74-85-1*0
Hydrogen chloride		-91.989	-92.173	± 0.0062	kJ/mol	36.46064 ± 0.00090	7647-01-0*0
Hydroxyl		37.242	37.482	± 0.027	kJ/mol	17.00734 ± 0.00031	3352-57-6*0
Methyl		149.829	146.414	± 0.080	kJ/mol	15.03452 ± 0.00083	2229-07-4*0
Carbon monoxide		-113.802	-110.522	± 0.026	kJ/mol	28.01010 ± 0.00085	630-08-0*0
Methanol		-189.95	-200.84	± 0.15	kJ/mol	32.04186 ± 0.00090	67-56-1*0
Hydrogen fluoride		-272.679	-272.726	± 0.049	kJ/mol	20.006343 ± 0.000070	7664-39-3*0
Hydrogen bromide		-27.72	-35.57	± 0.16	kJ/mol	80.9119 ± 0.0010	10035-10-6*0
Iodine atom		107.157	106.757	± 0.0021	kJ/mol	126.904470 ± 0.000030	14362-44-8*0
Formaldehyde		-105.347	-109.186	± 0.098	kJ/mol	30.02598 ± 0.00087	50-00-0*0
Acetylene		228.83	228.27	± 0.13	kJ/mol	26.0373 ± 0.0016	74-86-2*0
Ethyl		130.94	119.87	± 0.28	kJ/mol	29.0611 ± 0.0016	2025-56-1*0
Propane		-82.74	-105.03	± 0.19	kJ/mol	44.0956 ± 0.0025	74-98-6*0
Ethanol		-216.92	-234.64	± 0.21	kJ/mol	46.0684 ± 0.0017	64-17-5*0
Chloromethane		-74.17	-82.10	± 0.25	kJ/mol	50.4872 ± 0.0012	74-87-3*0
Nitric oxide		90.616	91.120	± 0.065	kJ/mol	30.00614 ± 0.00031	10102-43-9*0
Ammonia		-38.565	-45.557	± 0.030	kJ/mol	17.03056 ± 0.00022	7664-41-7*0
Hydrogen cyanide		129.668	129.283	± 0.091	kJ/mol	27.02538 ± 0.00081	74-90-8*0
Nitrogen dioxide		36.855	34.048	± 0.065	kJ/mol	46.00554 ± 0.00060	10102-44-0*0
Methyl fluoride		-227.44	-235.47	± 0.24	kJ/mol	34.03292 ± 0.00083	593-53-3*0
Hydrogen iodide		28.646	26.470	± 0.036	kJ/mol	127.912410 ± 0.000076	10034-85-2*0
Propene		34.98	19.98	± 0.21	kJ/mol	42.0797 ± 0.0024	115-07-1*0
Hydroxyde		-139.099	-139.066	± 0.027	kJ/mol	17.00789 ± 0.00031	14280-30-9*0
Hydrogen peroxide		-129.492	-135.478	± 0.063	kJ/mol	34.01468 ± 0.00062	7722-84-1*0
Dioxidanyl		15.12	12.21	± 0.15	kJ/mol	33.00674 ± 0.00060	3170-83-0*0
Methyl bromide		-20.18	-35.58	± 0.27	kJ/mol	94.9385 ± 0.0013	74-83-9*0
Benzene		100.58	83.07	± 0.23	kJ/mol	78.1118 ± 0.0048	71-43-2*0
Hypochlorous acid		-73.875	-76.815	± 0.028	kJ/mol	52.46004 ± 0.00095	7790-92-3*0
Acetaldehyde		-154.96	-165.44	± 0.28	kJ/mol	44.0526 ± 0.0017	75-07-0*0
Dibromine		45.68	30.89	± 0.12	kJ/mol	159.8080 ± 0.0020	7726-95-6*0
Fluoride		-250.912	-249.127	± 0.048	kJ/mol	18.99895178 ± 0.00000050	16984-48-8*0
Tetrafluoromethane		-927.41	-933.39	± 0.26	kJ/mol	88.00431 ± 0.00080	75-73-0*0
Methylene		391.03	391.59	± 0.12	kJ/mol	14.02658 ± 0.00081	2465-56-7*1
Methylene		428.70	429.11	± 0.12	kJ/mol	14.02658 ± 0.00081	2465-56-7*2
Methylidyne		592.81	596.15	± 0.11	kJ/mol	13.01864 ± 0.00080	3315-37-5*0
Tetrachloromethane		-93.50	-95.67	± 0.45	kJ/mol	153.8215 ± 0.0037	56-23-5*0
Diiodine		65.497	62.417	± 0.0041	kJ/mol	253.808940 ± 0.000060	7553-56-2*0
Formic acid		-371.06	-378.38	± 0.22	kJ/mol	46.0254 ± 0.0010	64-18-6*1
Propyne		192.82	185.76	± 0.25	kJ/mol	40.0639 ± 0.0024	74-99-7*0
Fluoroform		-688.79	-695.74	± 0.44	kJ/mol	70.01385 ± 0.00080	75-46-7*0
Toluene		73.44	50.15	± 0.34	kJ/mol	92.1384 ± 0.0056	108-88-3*0
Oxonium		605.84	599.09	± 0.17	kJ/mol	19.02267 ± 0.00037	13968-08-6*0
Chloride		-228.953	-227.346	± 0.0021	kJ/mol	35.45325 ± 0.00090	16887-00-6*0
Bromide		-206.620	-212.682	± 0.056	kJ/mol	79.90455 ± 0.00100	24959-67-9*0
Ozone		144.396	141.734	± 0.039	kJ/mol	47.99820 ± 0.00090	10028-15-6*0
Hypobromous acid		-51.71	-62.18	± 0.59	kJ/mol	96.9113 ± 0.0010	13517-11-8*0
Methoxy		28.99	21.62	± 0.29	kJ/mol	31.03392 ± 0.00088	2143-68-2*0
n-Butane		-98.65	-125.96	± 0.26	kJ/mol	58.1222 ± 0.0033	106-97-8*0
Chloroethane		-96.80	-111.38	± 0.20	kJ/mol	64.5138 ± 0.0019	75-00-3*0
Methylamine		-7.01	-21.72	± 0.31	kJ/mol	31.05714 ± 0.00088	74-89-5*0
Chlorine monoxide		101.125	101.716	± 0.035	kJ/mol	51.45210 ± 0.00095	14989-30-1*0
Trifluoromethyl		-465.02	-467.82	± 0.49	kJ/mol	69.00591 ± 0.00080	2264-21-3*0
Ethylium		914.95	902.87	± 0.31	kJ/mol	29.0606 ± 0.0016	14936-94-8*0
Hydroxymethyl		-10.49	-16.80	± 0.28	kJ/mol	31.03392 ± 0.00088	2597-43-5*0
Oxomethylium		827.804	827.220	± 0.098	kJ/mol	29.01749 ± 0.00086	17030-74-9*0
Vinyl		301.14	296.94	± 0.34	kJ/mol	27.0452 ± 0.0016	2669-89-8*0
Imidogen		358.74	358.79	± 0.17	kJ/mol	15.014680 ± 0.000099	13774-92-0*0
Allene		197.37	189.89	± 0.26	kJ/mol	40.0639 ± 0.0024	463-49-0*0
Methoxide		-122.48	-130.21	± 0.31	kJ/mol	31.03447 ± 0.00088	3315-60-4*0
Nitrilomethyl		436.71	439.99	± 0.15	kJ/mol	26.01744 ± 0.00080	2074-87-5*0
Dioxymethyl	$[O-]\[O+]=C$	111.90	104.90	± 0.63	kJ/mol	46.0254 ± 0.0010	56077-92-0*0
Difluorophosgene		-603.40	-606.50	± 0.48	kJ/mol	66.00691 ± 0.00085	353-50-4*0
Nitric acid		-124.49	-134.20	± 0.18	kJ/mol	63.01288 ± 0.00091	7697-37-2*0
Ketene		-45.37	-48.49	± 0.13	kJ/mol	42.0367 ± 0.0016	463-51-4*0
Formyl		41.429	41.805	± 0.098	kJ/mol	29.01804 ± 0.00086	2597-44-6*0
Phenol		-74.52	-93.12	± 0.68	kJ/mol	94.1112 ± 0.0048	108-95-2*0
Methylium		1099.234	1095.291	± 0.078	kJ/mol	15.03397 ± 0.00083	14531-53-4*0
Hypoflorous acid		-84.40	-87.30	± 0.19	kJ/mol	36.00574 ± 0.00031	14034-79-8*0
Iodide		-187.995	-188.396	± 0.0021	kJ/mol	126.905019 ± 0.000030	20461-54-5*0
Vinyl chloride		29.44	21.86	± 0.31	kJ/mol	62.4979 ± 0.0018	75-01-4*0
Phenyl		350.19	336.83	± 0.56	kJ/mol	77.1039 ± 0.0048	2396-01-2*0
Cyanogen chloride		135.04	135.73	± 0.47	kJ/mol	61.4701 ± 0.0012	506-77-4*0
Cyanogen bromide		187.1	180.5	± 1.1	kJ/mol	105.9214 ± 0.0013	506-68-3*0
Methyl iodide		24.40	14.86	± 0.18	kJ/mol	141.93899 ± 0.00083	74-88-4*0
Acetone		-199.56	-216.25	± 0.32	kJ/mol	58.0791 ± 0.0025	67-64-1*0
Oxygen atom anion		105.868	108.097	± 0.0021	kJ/mol	15.99995 ± 0.00030	14337-01-0*0
Ethoxide		-163.35	-178.29	± 0.53	kJ/mol	45.0610 ± 0.0017	16331-64-9*0
Hydrogen chloride			-166.454	± 0.024	kJ/mol	36.46064 ± 0.00090	7647-01-0*834
Amidogen		188.91	186.02	± 0.12	kJ/mol	16.02262 ± 0.00016	13770-40-6*0
Trihydrogen cation		1110.304	1106.696	± 0.013	kJ/mol	3.02327 ± 0.00021	28132-48-1*0
iso-Butane		-106.16	-134.76	± 0.32	kJ/mol	58.1222 ± 0.0033	75-28-5*0
Dichloromethane		-87.55	-94.41	± 0.49	kJ/mol	84.9320 ± 0.0020	75-09-2*0
Tetrabromomethane		133.2	103.5	± 1.3	kJ/mol	331.6267 ± 0.0041	558-13-4*0
Methylene fluoride		-443.00	-450.58	± 0.36	kJ/mol	52.02339 ± 0.00081	75-10-5*0
Oxygen difluoride		26.80	24.55	± 0.24	kJ/mol	53.99621 ± 0.00030	7783-41-7*0
Hypochlorite		-118.60	-118.33	± 0.13	kJ/mol	51.45265 ± 0.00095	14380-61-1*0
2-Propynyl		353.99	351.43	± 0.38	kJ/mol	39.0559 ± 0.0024	2932-78-7*0
Propynylidene		543.38	546.38	± 0.63	kJ/mol	38.0480 ± 0.0024	67152-18-5*1
Chloroform		-97.43	-102.34	± 0.52	kJ/mol	119.3767 ± 0.0028	67-66-3*0
Oxygen atom cation		1560.786	1562.644	± 0.0021	kJ/mol	15.99885 ± 0.00030	14581-93-2*0
1,2-Propadiene-1,3-diylidene		814.62	823.58	± 0.55	kJ/mol	36.0321 ± 0.0024	12075-35-3*0
Cyanic fluoride		8.78	9.11	± 0.71	kJ/mol	45.01584 ± 0.00080	1495-50-7*0
Allyl		179.54	167.82	± 0.55	kJ/mol	41.0718 ± 0.0024	1981-80-2*0
1-Hydroxyethyl		-42.00	-55.43	± 0.65	kJ/mol	45.0605 ± 0.0017	2348-46-1*1
2-Hydroxyethyl		-12.84	-26.11	± 0.63	kJ/mol	45.0605 ± 0.0017	4422-54-2*1
Methylperoxy		22.31	12.66	± 0.50	kJ/mol	47.0333 ± 0.0010	2143-58-0*0
Tetrafluoroethylene		-671.33	-674.73	± 0.58	kJ/mol	100.0150 ± 0.0016	116-14-3*0
Chlorine fluoride		-55.622	-55.717	± 0.055	kJ/mol	54.45110 ± 0.00090	7790-89-8*0
Diazynium		1042.54	1038.93	± 0.68	kJ/mol	29.02087 ± 0.00016	12357-66-3*0
Methanimine		96.25	88.34	± 0.62	kJ/mol	29.04126 ± 0.00083	2053-29-4*0
Nitrite		-182.63	-185.44	± 0.46	kJ/mol	46.00609 ± 0.00060	14797-65-0*0
Hydride		143.264	145.228	± 0.000	kJ/mol	1.008489 ± 0.000070	12184-88-2*0
Nitrosyl hydride		109.93	106.96	± 0.11	kJ/mol	31.01408 ± 0.00032	14332-28-6*0
Nitrous acid		-73.023	-79.167	± 0.079	kJ/mol	47.01348 ± 0.00061	7782-77-6*1
Ethynylene		820.28	828.74	± 0.27	kJ/mol	24.0214 ± 0.0016	12070-15-4*0
Ethynyl		563.87	567.99	± 0.15	kJ/mol	25.0293 ± 0.0016	2122-48-7*0
Methyl hydroperoxide		-115.03	-127.85	± 0.76	kJ/mol	48.0413 ± 0.0010	3031-73-0*0
iso-Propyl		105.05	88.18	± 0.56	kJ/mol	43.0877 ± 0.0024	2025-55-0*0
Phosgene		-217.44	-219.13	± 0.27	kJ/mol	98.9155 ± 0.0020	75-44-5*0
Fluoromethylidyne		243.14	246.74	± 0.13	kJ/mol	31.00910 ± 0.00080	3889-75-6*0
Phenylium		1148.45	1135.67	± 0.88	kJ/mol	77.1034 ± 0.0048	17333-73-2*0
Fluorooxidanyl		110.27	110.89	± 0.15	kJ/mol	34.99780 ± 0.00030	12061-70-0*0
Hypoiodous acid		-54.2	-59.0	± 3.1	kJ/mol	143.91181 ± 0.00031	14332-21-9*0
Methanium		921.98	911.73	± 0.45	kJ/mol	17.04985 ± 0.00087	15135-49-6*0
Hydroxylamine		-33.24	-43.62	± 0.50	kJ/mol	33.02996 ± 0.00037	7803-49-8*1
Oxirane		-40.01	-52.55	± 0.38	kJ/mol	44.0526 ± 0.0017	75-21-8*0
Hydroxyformyl		-181.19	-184.16	± 0.50	kJ/mol	45.0174 ± 0.0010	2564-86-5*1
Formate		-462.90	-466.55	± 0.56	kJ/mol	45.0180 ± 0.0010	71-47-6*0
Isocyanic acid		-115.84	-118.84	± 0.31	kJ/mol	43.02478 ± 0.00086	75-13-8*0
Chlorotrifluoromethane		-704.89	-710.00	± 0.72	kJ/mol	104.4586 ± 0.0012	75-72-9*0
Bromotrifluoromethane		-639.28	-651.40	± 0.51	kJ/mol	148.9099 ± 0.0013	75-63-8*0
Fluorobenzene		-99.10	-114.77	± 0.89	kJ/mol	96.1023 ± 0.0048	462-06-6*0
Nitromethane		-60.85	-74.75	± 0.46	kJ/mol	61.0401 ± 0.0010	75-52-5*0
Chlorine dioxide		101.32	98.85	± 0.27	kJ/mol	67.4515 ± 0.0011	10049-04-4*0
Dioxygen cation		1164.585	1165.221	± 0.0092	kJ/mol	31.99825 ± 0.00060	12185-07-8*0
Methylidyne		664.61	667.94	± 0.60	kJ/mol	13.01864 ± 0.00080	3315-37-5*2
Aminomethyl		158.90	149.06	± 0.44	kJ/mol	30.04920 ± 0.00085	10507-29-6*0
Ethoxy		1.84	-12.07	± 0.52	kJ/mol	45.0605 ± 0.0017	2154-50-9*51
Cyanato		127.03	127.50	± 0.35	kJ/mol	42.01684 ± 0.00086	22400-26-6*0
Dimethylamine		3.53	-18.11	± 0.48	kJ/mol	45.0837 ± 0.0017	124-40-3*0
Bromoform		75.2	49.1	± 1.3	kJ/mol	252.7306 ± 0.0031	75-25-2*0
Hydrogen fluoride			-334.48	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*800
Bromine monoxide		131.14	123.61	± 0.28	kJ/mol	95.9034 ± 0.0010	15656-19-6*0
Hypobromite		-96.15	-103.63	± 0.54	kJ/mol	95.9039 ± 0.0010	14380-62-2*0
Fluorodioxidanyl		26.80	25.09	± 0.26	kJ/mol	50.99720 ± 0.00060	15499-23-7*0
Peroxynitrous acid		-6.10	-14.54	± 0.36	kJ/mol	63.01288 ± 0.00091	14691-52-2*3
Cyclopropane		70.77	53.63	± 0.47	kJ/mol	42.0797 ± 0.0024	75-19-4*0
Propadienylidene		554.43	555.57	± 0.41	kJ/mol	38.0480 ± 0.0024	60731-10-4*0
1-Butene		20.86	-0.09	± 0.38	kJ/mol	56.1063 ± 0.0032	106-98-9*0
Acetyl		-3.37	-10.03	± 0.36	kJ/mol	43.0446 ± 0.0016	3170-69-2*0
Dichloromethylene		229.49	230.67	± 0.65	kJ/mol	82.9161 ± 0.0020	1605-72-7*2
Fluoroethane		-257.21	-272.07	± 0.38	kJ/mol	48.0595 ± 0.0016	353-36-6*0
Ethyl bromide		-41.12	-63.07	± 0.26	kJ/mol	108.9651 ± 0.0019	74-96-4*0
Vinyl fluoride		-134.62	-142.43	± 0.48	kJ/mol	46.0436 ± 0.0016	75-02-5*0
Vinyl bromide		88.77	73.97	± 0.61	kJ/mol	106.9492 ± 0.0019	593-60-2*0
2-Bromoethanol		-196.57	-220.63	± 0.57	kJ/mol	124.9645 ± 0.0019	540-51-2*0
Chlorobenzene		67.13	52.17	± 0.61	kJ/mol	112.5566 ± 0.0049	108-90-7*0
Difluorodioxidane		35.29	31.57	± 0.41	kJ/mol	69.99561 ± 0.00060	7783-44-0*0
Nitrous oxide		85.991	82.562	± 0.097	kJ/mol	44.01288 ± 0.00033	10024-97-2*0
(E)-Diazene		207.09	199.95	± 0.44	kJ/mol	30.02936 ± 0.00020	15626-43-4*0
Hydroxyoxomethylium		600.69	597.60	± 0.44	kJ/mol	45.0169 ± 0.0010	638-71-1*0
Trioxidane		-81.71	-90.55	± 0.72	kJ/mol	50.01408 ± 0.00091	14699-99-1*1
Vinylium		1119.15	1115.70	± 0.59	kJ/mol	27.0447 ± 0.0016	14604-48-9*0
Hydroxymethylium		717.75	709.80	± 0.18	kJ/mol	31.03337 ± 0.00088	18682-95-6*0
Cyanogen		308.24	310.18	± 0.43	kJ/mol	52.0349 ± 0.0016	460-19-5*0
Propyl		118.27	100.87	± 0.60	kJ/mol	43.0877 ± 0.0024	2143-61-5*0
Dioxidanide		-88.87	-91.53	± 0.35	kJ/mol	33.00729 ± 0.00060	14691-59-9*0
n-Butyl		102.52	80.02	± 0.72	kJ/mol	57.1143 ± 0.0033	2492-36-6*0
1,3-Butadiene		125.05	110.57	± 0.40	kJ/mol	54.0904 ± 0.0032	106-99-0*0
n-Pentane		-114.50	-146.38	± 0.31	kJ/mol	72.1488 ± 0.0041	109-66-0*0
Ethynide		277.42	280.83	± 0.18	kJ/mol	25.0299 ± 0.0016	29075-95-4*0
Formic acid		-371.06	-378.36	± 0.22	kJ/mol	46.0254 ± 0.0010	64-18-6*0
2-Chloroethanol		-250.05	-266.76	± 0.63	kJ/mol	80.5132 ± 0.0019	107-07-3*0
Bromobenzene		126.6	104.6	± 1.3	kJ/mol	157.0079 ± 0.0049	108-86-1*0
Benzaldehyde		-19.22	-37.02	± 0.92	kJ/mol	106.1219 ± 0.0056	100-52-7*0
Hypofluorite		-108.85	-108.68	± 0.48	kJ/mol	34.99835 ± 0.00030	12763-66-5*0
Chlorous acid		25.75	20.69	± 0.63	kJ/mol	68.4594 ± 0.0011	13898-47-0*0
Water			-285.836	± 0.027	kJ/mol	18.01528 ± 0.00033	7732-18-5*590
Iodoxyl radical		126.97	125.04	± 0.82	kJ/mol	142.90387 ± 0.00030	14696-98-1*0
Ammonium		643.04	631.73	± 0.21	kJ/mol	18.03795 ± 0.00029	14798-03-9*0
Azanide		114.89	112.02	± 0.33	kJ/mol	16.02317 ± 0.00016	17655-31-1*0
Hydroxyamidogen		101.6	94.8	± 1.1	kJ/mol	32.02202 ± 0.00034	13940-32-4*1
Nitrate		-300.30	-306.77	± 0.62	kJ/mol	62.00549 ± 0.00090	14797-55-8*0
Cyanogen iodide		222.5	222.0	± 1.6	kJ/mol	152.92191 ± 0.00080	506-78-5*0
Formyl anion		11.63	12.02	± 0.44	kJ/mol	29.01859 ± 0.00086	57340-31-5*0
2-Propynylidyne		717.94	722.29	± 0.81	kJ/mol	37.0400 ± 0.0024	53590-28-6*0
Isobutene		3.95	-17.12	± 0.43	kJ/mol	56.1063 ± 0.0032	115-11-7*0
Methanetetraylbisamidogen		450.41	450.81	± 0.68	kJ/mol	40.02418 ± 0.00081	2669-76-3*0
Trichloromethyl		71.91	71.43	± 0.86	kJ/mol	118.3688 ± 0.0028	3170-80-7*0
Chloromethylene		320.24	320.52	± 0.89	kJ/mol	48.4713 ± 0.0012	2108-20-5*2
Methylene bromide		25.5	4.1	± 1.1	kJ/mol	173.8346 ± 0.0022	74-95-3*0
2-Fluoroethanol		-406.6	-423.9	± 1.3	kJ/mol	64.0589 ± 0.0017	371-62-0*0
Phenide		244.44	231.01	± 0.42	kJ/mol	77.1044 ± 0.0048	30922-78-2*0
Phenolate		-146.09	-161.56	± 0.93	kJ/mol	93.1038 ± 0.0048	3229-70-7*0
Chloronium		881.3	878.2	± 1.1	kJ/mol	37.46803 ± 0.00091	36658-55-6*0
Chlorine trifluoride		-158.6	-162.7	± 1.2	kJ/mol	92.44791 ± 0.00090	7790-91-2*0
Iodine monochloride		19.024	17.391	± 0.013	kJ/mol	162.35717 ± 0.00090	7790-99-0*0
Iodotrifluoromethane		-583.82	-589.70	± 0.55	kJ/mol	195.91038 ± 0.00080	2314-97-8*0
Nitrogen atom cation		1872.907	1875.688	± 0.024	kJ/mol	14.006191 ± 0.000070	14158-23-7*0
Azido radical		452.25	449.66	± 0.60	kJ/mol	42.02022 ± 0.00021	12596-60-0*0
Trinitrogen cation		1519.41	1516.88	± 0.89	kJ/mol	42.01967 ± 0.00021	12185-03-4*0
Oxonitrate anion		87.91	87.94	± 0.12	kJ/mol	30.00669 ± 0.00031	14967-78-3*0
Carbon monoxide cation		1238.308	1241.588	± 0.026	kJ/mol	28.00955 ± 0.00085	12144-04-6*0
Nitrosyl ion		984.484	984.479	± 0.065	kJ/mol	30.00559 ± 0.00031	14452-93-8*0
Nitroxyl		71.13	64.52	± 0.90	kJ/mol	32.02202 ± 0.00034	13408-29-2*0
Hydrazoic acid		297.90	291.61	± 0.49	kJ/mol	43.02816 ± 0.00022	7782-79-8*0
Ethanium		874.39	858.12	± 0.62	kJ/mol	31.0764 ± 0.0017	24669-33-8*1
Acetylium		666.87	659.58	± 0.47	kJ/mol	43.0441 ± 0.0016	15762-07-9*0
Cyanide		63.964	67.250	± 0.095	kJ/mol	26.01799 ± 0.00080	57-12-5*0
Hydroxymethylene		112.70	108.93	± 0.28	kJ/mol	30.02598 ± 0.00087	19710-56-6*1
Carbonic acid		-602.74	-612.91	± 0.79	kJ/mol	62.0248 ± 0.0012	463-79-6*1
Hydrogen bromide			-120.71	± 0.16	kJ/mol	80.9119 ± 0.0010	10035-10-6*800
n-Hexane		-130.10	-166.98	± 0.34	kJ/mol	86.1754 ± 0.0049	110-54-3*0
1-Hydroxyethylium		609.13	594.70	± 0.39	kJ/mol	45.0600 ± 0.0017	18682-96-7*1
Ethoxy		6.09	-8.35	± 0.52	kJ/mol	45.0605 ± 0.0017	2154-50-9*52
Dicarbon monoxide		377.3	381.3	± 1.1	kJ/mol	40.0208 ± 0.0016	12071-23-7*1
Formic acid		-354.70	-361.94	± 0.39	kJ/mol	46.0254 ± 0.0010	64-18-6*2
Formyloxidanyl		-125.57	-127.23	± 0.56	kJ/mol	45.0174 ± 0.0010	16499-21-1*1
Trimethylamine		1.16	-27.69	± 0.92	kJ/mol	59.1103 ± 0.0025	75-50-3*0
Chlorodifluoromethane		-476.4	-482.5	± 1.2	kJ/mol	86.4681 ± 0.0012	75-45-6*0
Fluoromethylene		148.34	148.62	± 0.46	kJ/mol	32.01704 ± 0.00080	13453-52-6*2
Fluoroformyl		-176.61	-176.03	± 0.39	kJ/mol	47.00850 ± 0.00085	1871-24-5*0
Hydrogen chloride			-166.993	± 0.023	kJ/mol	36.46064 ± 0.00090	7647-01-0*800
Bromonium		925.2	914.5	± 1.5	kJ/mol	81.9193 ± 0.0010	36658-54-5*0
Hydrogen peroxide cation		896.57	889.59	± 0.58	kJ/mol	34.01413 ± 0.00062	12325-10-9*1
Hydrazine		111.56	97.41	± 0.49	kJ/mol	32.04524 ± 0.00031	302-01-2*0
Ethylidene		361.30	354.30	± 0.91	kJ/mol	28.0532 ± 0.0016	4218-50-2*1
Vinyl anion		237.01	232.59	± 0.87	kJ/mol	27.0458 ± 0.0016	25012-81-1*0
Aminomethylium		763.55	751.58	± 0.66	kJ/mol	30.04865 ± 0.00085	488821-23-4*0
Peroxyformic acid		-279.8	-289.1	± 1.1	kJ/mol	62.0248 ± 0.0012	107-32-4*1
1-Methylethenyl		262.81	252.46	± 0.78	kJ/mol	41.0718 ± 0.0024	15552-77-9*0
trans-2-Butene		9.24	-11.32	± 0.41	kJ/mol	56.1063 ± 0.0032	624-64-6*0
cis-2-Butene	$C/C=C\C$	13.93	-7.34	± 0.42	kJ/mol	56.1063 ± 0.0032	590-18-1*0
Cyclopentane		-45.04	-77.61	± 0.44	kJ/mol	70.1329 ± 0.0041	287-92-3*0
Cyclopentadiene		149.85	132.73	± 0.76	kJ/mol	66.1011 ± 0.0040	542-92-7*0
1-Hydroxyethyl		-40.46	-53.93	± 0.93	kJ/mol	45.0605 ± 0.0017	2348-46-1*2
Protonated oxirane		725.23	709.06	± 0.67	kJ/mol	45.0600 ± 0.0017	38607-31-70
Ethenol		-112.76	-123.95	± 0.84	kJ/mol	44.0526 ± 0.0017	557-75-5*1
Oxoethenyl		176.97	178.09	± 0.61	kJ/mol	41.0287 ± 0.0016	51095-15-9*0
Methanediol		-379.2	-393.4	± 1.1	kJ/mol	48.0413 ± 0.0010	463-57-0*1
Trioxidanide		-120.0	-123.1	± 1.6	kJ/mol	49.00669 ± 0.00090	89965-38-8*2
Acetyl chloride		-232.68	-241.55	± 0.33	kJ/mol	78.4973 ± 0.0019	75-36-5*0
Methyl formate		-344.73	-357.78	± 0.59	kJ/mol	60.0520 ± 0.0017	107-31-3*1
Chlorohydroxymethyl		-54.7	-60.7	± 1.1	kJ/mol	65.4787 ± 0.0012	147139-06-8*1
1,1-Dichloroethene		8.91	2.92	± 0.51	kJ/mol	96.9427 ± 0.0024	75-35-4*0
Tetrachloroethene		-22.3	-23.1	± 1.1	kJ/mol	165.8322 ± 0.0039	127-18-4*0
Difluorodichloromethane		-490.42	-495.18	± 0.97	kJ/mol	120.9129 ± 0.0020	75-71-8*0
Fluorodichloromethane		-278.7	-284.0	± 1.3	kJ/mol	102.9224 ± 0.0020	75-43-4*0
Trifluoromethylium		409.16	406.09	± 0.52	kJ/mol	69.00536 ± 0.00080	18851-76-8*0
Fluoromethylene		210.16	210.50	± 0.72	kJ/mol	32.01704 ± 0.00080	13453-52-6*1
Formyl fluoride		-378.64	-382.23	± 0.33	kJ/mol	48.01644 ± 0.00086	1493-02-3*0
Methyl nitrite		-55.58	-67.36	± 0.45	kJ/mol	61.0401 ± 0.0010	624-91-9*2
Chlorine pentafluoride		-226.1	-234.2	± 1.7	kJ/mol	130.44472 ± 0.00090	13637-63-3*0
Chloro hypochlorite		79.78	77.97	± 0.36	kJ/mol	86.9048 ± 0.0018	7791-21-1*0
Chlorooxy hypochlorite		134.55	131.32	± 0.56	kJ/mol	102.9042 ± 0.0019	12292-23-8*0
Peroxyhypochlorous acid		3.93	-1.34	± 0.95	kJ/mol	68.4594 ± 0.0011	67952-07-2*0
Hypoiodite		-102.48	-104.29	± 0.88	kJ/mol	142.90442 ± 0.00030	15065-65-3*0
Dinitrogen cation		1503.311	1503.312	± 0.0011	kJ/mol	28.01293 ± 0.00014	13966-04-6*0
Carbon dioxide cation		936.092	936.927	± 0.017	kJ/mol	44.00895 ± 0.00100	12181-61-2*0
Nitrogen sesquioxide		90.71	86.15	± 0.15	kJ/mol	76.01168 ± 0.0