Hydrazine
- Formula: H4N2
- Molecular weight: 32.0452
- IUPAC Standard InChI: InChI=1S/H4N2/c1-2/h1-2H2
- IUPAC Standard InChIKey: OAKJQQAXSVQMHS-UHFFFAOYSA-N
- CAS Registry Number: 302-01-2
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Levoxine; N2H4; Diamine; Hydrazyna; Rcra waste number U133; Hydrazine, anhydrous; Hydrazine base; Nitrogen hydride, (N2H4); Oxytreat 35
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Gas phase thermochemistry data
Go To: Top, Reaction 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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 22.79 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1965 |
| ΔfH°gas | 36. ± 2. | kcal/mol | Ion | Willis, Lossing, et al., 1976 | Appearance potentials; ALS |
| ΔfH°gas | 12.05 | kcal/mol | Cm | Cole and Gilbert, 1951 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°gas | -148.68 | kcal/mol | Cm | Cole and Gilbert, 1951 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 57.041 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1965 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 800. to 2000. | 2000. to 6000. |
|---|---|---|
| A | 8.408796 | 29.01554 |
| B | 22.95712 | 1.151262 |
| C | -9.680044 | -0.182364 |
| D | 1.593707 | 0.010333 |
| E | -0.208947 | -9.748208 |
| F | 18.64042 | -2.720149 |
| G | 59.61401 | 72.97897 |
| H | 22.79001 | 22.79001 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in December, 1965 | Data last reviewed in December, 1965 |
Reaction thermochemistry data
Go To: Top, Gas 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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
+ 0.5
=
+
+ 0.5
By formula: C4H4BrNO2 + 0.5H4N2 = HBr + C4H5NO2 + 0.5N2
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -62.22 ± 0.11 | kcal/mol | Cm | Howard and Skinner, 1966 | solid phase; solvent: Aqueous solution; Reanalyzed by Pedley, Naylor, et al., 1986, Original value = -62.55 ± 0.11 kcal/mol |
+ 0.5
=
+
+ 0.5
By formula: C4H4ClNO2 + 0.5H4N2 = C4H5NO2 + HCl + 0.5N2
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -67.78 ± 0.07 | kcal/mol | Cm | Howard and Skinner, 1966 | solid phase; solvent: Aqueous solution |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Willis, Lossing, et al., 1976
Willis, C.; Lossing, F.P.; Back, R.A.,
The heat of formation of N2H2 and the proton affinity of N2,
Can. J. Chem., 1976, 54, 1-3. [all data]
Cole and Gilbert, 1951
Cole, L.G.; Gilbert, E.C.,
The heats of combustion of some nitrogen compounds and the apparent energy of the N-N bond,
J. Am. Chem. Soc., 1951, 73, 5423-5427. [all data]
Howard and Skinner, 1966
Howard, P.B.; Skinner, H.A.,
Thermochemistry of some reactions of aqueous hydrazine with halogens, hydrogen halides and N-halogenosuccinimides,
J. Chem. Soc. A, 1966, 1536-1540. [all data]
Pedley, Naylor, et al., 1986
Pedley, J.B.; Naylor, R.D.; Kirby, S.P.,
Thermochemical Data of Organic Compounds, Chapman and Hall, New York, 1986, 1-792. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔcH°gas Enthalpy of combustion of gas at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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