Nitric acid
- Formula: HNO3
- Molecular weight: 63.0128
- IUPAC Standard InChI: InChI=1S/HNO3/c2-1(3)4/h(H,2,3,4)
- IUPAC Standard InChIKey: GRYLNZFGIOXLOG-UHFFFAOYSA-N
- CAS Registry Number: 7697-37-2
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Phase change data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -32.101 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1963 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 63.669 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1963 |
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) | 298. to 1200. | 1200. to 6000. |
|---|---|---|
| A | 4.692230 | 23.29340 |
| B | 36.79730 | 1.297701 |
| C | -27.68590 | -0.246101 |
| D | 7.858402 | 0.016241 |
| E | -0.059540 | -2.938131 |
| F | -35.10559 | -46.00650 |
| G | 59.20289 | 82.17139 |
| H | -32.09990 | -32.09990 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in June, 1963 | Data last reviewed in June, 1963 |
Phase change 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: William E. Acree, Jr., James S. Chickos
Enthalpy of vaporization
| ΔvapH (kcal/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 9.23 | 312. | Holeci, 1966 | Based on data from 273. to 356. K. |
References
Go To: Top, Gas 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.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Holeci, 1966
Holeci, I.,
Chem. Prum., 1966, 16, 5, 267. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Phase change data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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