Ammonium thiocyanate
- Formula: CH4N2S
- Molecular weight: 76.121
- IUPAC Standard InChI: InChI=1S/CHNS.H3N/c2-1-3;/h3H;1H3
- IUPAC Standard InChIKey: SOIFLUNRINLCBN-UHFFFAOYSA-N
- CAS Registry Number: 1762-95-4
- Chemical structure:
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Condensed phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| S°solid,1 bar | 140.2 | J/mol*K | N/A | Vanderzee and Westrum, 1970 |
Constant pressure heat capacity of solid
| Cp,solid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 125.4 | 298.15 | Vanderzee and Westrum, 1970 | T = 5 to 340 K. |
Phase change data
Go To: Top, Condensed phase thermochemistry data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 133.9 | kJ/mol | N/A | Luft, 1955 | AC |
Enthalpy of phase transition
| ΔHtrs (kJ/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 3.200 | 360.7 | crystaline, II | crystaline, I | Petropavlov, Tsygankova, et al., 1988 | DH |
Entropy of phase transition
| ΔStrs (J/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 8.9 | 360.7 | crystaline, II | crystaline, I | Petropavlov, Tsygankova, et al., 1988 | DH |
References
Go To: Top, Condensed phase thermochemistry data, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Vanderzee and Westrum, 1970
Vanderzee, C.E.; Westrum, E.F., Jr.,
Heat capacities and thermodynamic properties of ammonium and potassium thiocyanates from 5 to 340K,
J. Chem. Thermodynam., 1970, 2, 417-429. [all data]
Luft, 1955
Luft, N.W.,
Ind. Chemist, 1955, 31, 502. [all data]
Petropavlov, Tsygankova, et al., 1988
Petropavlov, N.N.; Tsygankova, I.G.; Teslenko, L.A.,
Microcalorimetric investigation of polymorphic transitions in organic crystals,
Sov. Phys. Crystallogr., 1988, 33(6), 853-855. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Cp,solid Constant pressure heat capacity of solid S°solid,1 bar Entropy of solid at standard conditions (1 bar) ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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