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Thermochemical Properties (see the Download & Cite page for data in the NASA polynomial form)
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Species |
Name |
Structure |
CAS No. |
ΔfHο298 (kcal/mol) |
So298 (cal/mol-K) |
Cp (kcal/mol) |
|
||||||
|
298 |
500 |
1000 |
1500 |
2000 |
2500 |
Source |
|||||||
|
H2 |
Hydrogen |
1333-74-0 |
0.00 |
31.23 |
6.892 |
7.002 |
7.209 |
7.734 |
8.173 |
8.541 |
Reference element |
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|
H |
Atomic hydrogen |
12385-13-6 |
52.10 |
±0.00 |
27.42 |
4.968 |
4.968 |
4.968 |
4.968 |
4.968 |
4.968 |
ATcT 31.01.2011 |
|
|
O |
Atomic oxygen |
17778-80-2 |
59.57 |
±0.00 |
38.49 |
5.237 |
5.078 |
5.001 |
4.983 |
4.976 |
4.984 |
ATcT 31.01.2011 |
|
|
O2 |
Molecular oxygen |
7782-44-7 |
0.00 |
49.03 |
7.021 |
7.429 |
8.337 |
8.725 |
9.048 |
9.321 |
Reference element |
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|
OH |
Hydroxyl radical |
3352-57-6 |
8.96 |
±0.01 |
43.91 |
7.143 |
7.046 |
7.336 |
7.885 |
8.297 |
8.609 |
ATcT 31.01.2011 |
|
|
OH* |
OH A 2Sigma+ |
3352-57-6 |
102.89 |
42.81 |
6.968 |
7.005 |
7.541 |
8.159 |
8.594 |
8.905 |
Uncertainty unknown |
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|
H2O |
Water(v) |
7732-18-5 |
-57.80 |
±0.01 |
45.13 |
8.027 |
8.416 |
9.87 |
11.313 |
12.351 |
13.081 |
ATcT 31.01.2011 |
|
|
HO2 |
Perhydroxyl radical |
3170-83-0 |
2.93 |
±0.04 |
54.75 |
8.339 |
9.465 |
11.38 |
12.483 |
13.33 |
13.954 |
ATcT 31.01.2011 |
|
|
H2O2 |
Hydrogen peroxide |
7722-84-1 |
-32.37 |
±0.01 |
56.05 |
10.136 |
11.993 |
14.947 |
16.592 |
17.678 |
18.381 |
ATcT 31.01.2011 |
|
|
C |
Carbon atom |
7440-44-0 |
171.34 |
±0.01 |
37.78 |
4.981 |
4.972 |
4.97 |
4.969 |
5.012 |
5.084 |
ATcT 31.01.2011 |
|
|
CH |
Methylidyne |
3315-37-5 |
142.49 |
±0.03 |
43.74 |
6.973 |
7.029 |
7.712 |
8.572 |
9.194 |
9.629 |
ATcT 31.01.2011 |
|
|
CH* |
CH A2Delta |
3315-37-5 |
209.40 |
42.33 |
6.968 |
7.029 |
7.671 |
8.295 |
8.729 |
9.037 |
Uncertainty unknown |
||
|
CH2 |
Methylene radical |
2465-56-7 |
93.56 |
±0.03 |
46.46 |
8.368 |
9.072 |
10.589 |
11.772 |
12.52 |
12.97 |
ATcT 31.01.2011 |
|
|
CH2(S) |
Methylene radical excited |
2465-56-7 |
102.54 |
±0.03 |
45.22 |
8.074 |
8.662 |
10.575 |
11.908 |
12.851 |
13.506 |
ATcT 31.01.2011 |
|
|
CH3 |
Methyl radical |
2229-07-4 |
35.01 |
±0.02 |
46.36 |
9.181 |
10.755 |
14.089 |
16.248 |
17.573 |
18.336 |
ATcT 31.01.2011 |
|
|
CH4 |
Methane |
74-82-8 |
-17.81 |
±0.01 |
44.54 |
8.529 |
11.114 |
17.622 |
21.624 |
24.299 |
26.119 |
ATcT 31.01.2011 |
|
|
CO |
Carbon monoxide |
630-08-0 |
-26.42 |
±0.01 |
47.24 |
6.965 |
7.125 |
7.926 |
8.397 |
8.673 |
8.823 |
ATcT 31.01.2011 |
|
|
CO2 |
Carbon dioxide |
124-38-9 |
-94.04 |
±0.00 |
51.09 |
8.874 |
10.664 |
12.983 |
13.916 |
14.452 |
14.733 |
ATcT 31.01.2011 |
|
|
HCO |
Formyl radical |
HC=O |
2597-44-6 |
10.00 |
±0.02 |
53.60 |
8.288 |
9.287 |
11.665 |
12.943 |
13.925 |
14.691 |
ATcT 31.01.2011 |
|
CH2O |
Formaldehyde |
H2C=O |
50-00-0 |
-26.09 |
±0.02 |
52.28 |
8.457 |
10.438 |
14.817 |
16.93 |
18.142 |
18.769 |
ATcT 31.01.2011 |
|
CH2OH |
Hydroxymethyl radical |
H2C-OH |
2597-43-5 |
-3.85 |
±0.10 |
58.35 |
11.327 |
14.166 |
18.441 |
20.594 |
21.882 |
22.591 |
ATcT 31.01.2011 |
|
CH3O |
Methoxy radical |
H3C-O |
2143-68-2 |
5.22 |
±0.08 |
55.99 |
10.165 |
13.863 |
19.701 |
22.25 |
23.718 |
24.483 |
ATcT 31.01.2011 |
|
CH3OH |
Methanol |
H3C-OH |
67-56-1 |
-47.97 |
±0.04 |
57.51 |
10.255 |
14.071 |
21.381 |
25.068 |
27.263 |
28.471 |
ATcT 31.01.2011 |
|
C2H |
Ethynyl radical |
HC☰C |
2122-48-7 |
135.73 |
±0.04 |
50.97 |
10.035 |
10.883 |
12.564 |
13.878 |
14.621 |
14.982 |
ATcT 31.01.2011 |
|
C2H2 |
Ethyne, Acetylene |
HC☰CH |
74-86-2 |
54.57 |
±0.03 |
48.01 |
10.514 |
13.077 |
16.231 |
18.142 |
19.37 |
20.139 |
ATcT 31.01.2011 |
|
C2H3 |
Vinyl radical |
H2C=CH |
2669-89-8 |
71.05 |
±0.11 |
55.84 |
10.052 |
13.458 |
18.783 |
21.507 |
23.143 |
24.054 |
ATcT 31.01.2011 |
|
C2H4 |
Ethene, ethylene |
H2C=CH2 |
74-85-1 |
12.56 |
±0.03 |
52.41 |
10.247 |
14.885 |
22.49 |
26.193 |
28.379 |
29.564 |
ATcT 31.01.2011 |
|
C2H5 |
Ethyl radical |
H3C-CH2 |
2025-56-1 |
28.61 |
±0.17 |
58.07 |
12.109 |
17.125 |
25.794 |
30.168 |
32.748 |
34.145 |
ATcT 10.05.2012 |
|
C2H6 |
Ethane |
H3C-CH3 |
74-84-0 |
-20.02 |
±0.04 |
54.78 |
12.544 |
18.58 |
29.322 |
34.71 |
37.873 |
39.573 |
ATcT 31.01.2011 |
|
HCCO |
Ketenyl radical |
HC=C=O |
51095-15-9 |
42.53 |
±0.14 |
58.89 |
11.942 |
14.207 |
16.935 |
18.269 |
19.067 |
19.51 |
ATcT 31.01.2011 |
|
CH2CO |
Ketene |
H2C=C=O |
463-51-4 |
-11.61 |
±0.03 |
60.09 |
12.363 |
15.677 |
20.252 |
22.485 |
23.799 |
24.508 |
ATcT 31.01.2011 |
|
CH2CHO |
Vinoxy radical |
CH2=CH-O |
6912-06-7 |
3.05 |
±1.91 |
61.85 |
12.52 |
17.251 |
24.022 |
27.131 |
28.958 |
29.943 |
No ATcT value |
|
CH3CHO |
Acetaldehyde |
H3C-C(H)=O |
75-07-0 |
-39.53 |
±0.07 |
63.08 |
13.218 |
18.292 |
26.914 |
30.96 |
33.304 |
34.537 |
ATcT 31.01.2011 |
|
CH3CO |
Acetyl radical |
CH3-C=O |
3170-69-2 |
-2.31 |
±0.09 |
63.92 |
12.135 |
16.299 |
23.196 |
26.343 |
28.158 |
29.107 |
ATcT 31.01.2011 |
|
H2CC |
Vinylidene |
H2C=C |
2143-69-3 |
98.54 |
±0.15 |
52.82 |
10.183 |
12.089 |
15.19 |
16.948 |
18.022 |
18.635 |
ATcT 31.01.2011 |
|
HE |
Helium |
7440-59-7 |
0.00 |
30.15 |
4.968 |
4.968 |
4.968 |
4.968 |
4.968 |
4.968 |
Reference element |
||
|
AR |
Argon |
7440-37-1 |
0.00 |
37.01 |
4.968 |
4.968 |
4.968 |
4.968 |
4.968 |
4.968 |
Reference element |
||
|
N2 |
Nitrogen |
|
7727-37-9 |
0.00 |
|
45.79 |
6.961 |
7.074 |
7.811 |
8.309 |
8.606 |
8.772 |
Reference element |