Table 2. Formation Enthalpies and Uncertainties (2σ) Computed via Isodesmic and Atomization Methods, together with ATcT, ANL0, and ANL1 Formation Enthalpies and Uncertainties.

species	isodesmic (0 K, kJ mol–1)	isodesmic (2σ)	atomization (0 K, kJ mol–1)	atomization (2σ)	ATcT52,53 (0 K, kJ mol–1)	ANL054	ANL154	Burcat58 (0 K, kJ mol–1)
C2H4	60.60	0.45	61.36	3.85	60.88	60.20	60.20	61.03
Ċ2H5	131.65	0.74	131.06	6.65	131.06	131.30	131.00	130.77
Ċ2H3	301.49	0.96	301.26	5.41	301.13	300.90	300.50	300.87
C3H6	35.03	0.36	35.85	7.33	34.93	34.50		35.01
nĊ3H7	117.78	0.66	118.15	9.75	118.34	118.20		119.15
iĊ3H7	105.33	0.92	105.71	9.63	105.32	105.10		108.24
Ċ3H5-s	277.86	0.87	278.38	7.53	278.22	278.40		276.29
Ċ3H5-t	262.28	0.95	262.80	6.86	262.98	263.00
Ċ3H5-a	177.44	2.00	179.03	6.69	180.03	179.60		180.40
C4H8-1	21.15	0.20	22.40	10.66	21.00	21.30		20.82
C4H8-2	9.40	0.25	10.63	10.86	9.38	9.60		9.39
Ċ4H9-1	102.20	0.77	102.52	13.08	102.74	103.20		105.91
Ċ4H9-2	90.76	0.74	91.55	12.82	90.84	90.90		94.95
Ċ4H7-11	263.61	0.79	263.97	10.27				262.76
Ċ4H7-12	248.88	0.81	249.16	9.84				248.45
Ċ4H7-13	152.70	0.81	152.04	9.48				153.55
Ċ4H7-14	222.83	0.77	224.34	12.26				220.92
Ċ4H7-22	239.46	1.24	240.21	9.97				239.74
iC4H8	3.61	0.31	5.19	10.72	4.01	4.20		3.46
iĊ4H9	96.14	0.73	96.38	12.91	97.17			97.92
tĊ4H9	73.86	0.73	75.31	13.23	75.60			79.72
iĊ4H7	153.25	0.81	153.73	9.49				155.27
iĊ4H7-i1	250.60	0.70	251.18	10.45