Nitrous acid


Gas 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.

Quantity Value Units Method Reference Comment
Δfgas-18.34kcal/molReviewChase, 1998Data last reviewed in June, 1963
Quantity Value Units Method Reference Comment
gas,1 bar59.610cal/mol*KReviewChase, 1998Data 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 6000.298. to 2000.2000. to 6000.
A 5.95118117.603109.03207518.90629
B 21.839301.16037012.960850.398523
C -15.49860-0.220222-6.513241-0.062965
D 4.2830000.0145411.2191660.003561
E -0.032203-2.177771-0.121963-3.596559
F -21.06500-28.53480-22.46453-31.16109
G 60.7713074.1740066.2275374.41635
H -18.34010-18.34010-18.84001-18.84001
ReferenceChase, 1998Chase, 1998Chase, 1998Chase, 1998
Comment Data last reviewed in June, 1963 Data last reviewed in June, 1963 Data last reviewed in June, 1963 Data last reviewed in June, 1963

Reaction 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 as indicated in comments:
B - John E. Bartmess
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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Individual Reactions

Nitrogen oxide anion + Hydrogen cation = Nitrous acid

By formula: NO2- + H+ = HNO2

Quantity Value Units Method Reference Comment
Δr340.23 ± 0.21kcal/molD-EAErvin, Ho, et al., 1988gas phase; B
Quantity Value Units Method Reference Comment
Δr333.73 ± 0.31kcal/molH-TSErvin, Ho, et al., 1988gas phase; B

Nitrogen oxide anion + Nitrous acid = (Nitrogen oxide anion • Nitrous acid)

By formula: NO2- + HNO2 = (NO2- • HNO2)

Quantity Value Units Method Reference Comment
Δr32.5 ± 1.0kcal/molTDAsLee, Keesee, et al., 1980gas phase; B

Benzenamine, N-ethyl- + Nitrous acid = Benzenamine, N-ethyl-N-nitroso- + Water

By formula: C8H11N + HNO2 = C8H10N2O + H2O

Quantity Value Units Method Reference Comment
Δr-18.84kcal/molCmSwientoslawski, 1910liquid phase; ALS

Diphenylamine + Nitrous acid = Water + N-Nitrosodiphenylamine

By formula: C12H11N + HNO2 = H2O + C12H10N2O

Quantity Value Units Method Reference Comment
Δr-15.02kcal/molCmSwientoslawski, 1910solid phase; ALS

Gas phase ion energetics 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 as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman

Ionization energy determinations

IE (eV) Method Reference Comment
≤11.3DERLias, Bartmess, et al., 1988LL

De-protonation reactions

Nitrogen oxide anion + Hydrogen cation = Nitrous acid

By formula: NO2- + H+ = HNO2

Quantity Value Units Method Reference Comment
Δr340.23 ± 0.21kcal/molD-EAErvin, Ho, et al., 1988gas phase; B
Quantity Value Units Method Reference Comment
Δr333.73 ± 0.31kcal/molH-TSErvin, Ho, et al., 1988gas phase; B

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics 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]

Ervin, Ho, et al., 1988
Ervin, K.M.; Ho, J.; Lineberger, W.C., Ultraviolet Photoelectron Spectrum of NO2-, J. Phys. Chem., 1988, 92, 19, 5405, https://doi.org/10.1021/j100330a017 . [all data]

Lee, Keesee, et al., 1980
Lee, N.; Keesee, R.G.; Castleman, A.W., Jr., The properties of clusters in the gas phase. IV. Complexes of H2O and HNOx clustering on NOx-, J. Chem. Phys., 1980, 72, 1089. [all data]

Swientoslawski, 1910
Swientoslawski, W., Thermochemische Untersuchungen der organischen Verbindungen. Dritte Mitteilung. Stickstoffhaltige Verbindungen., Z. Phys. Chem., 1910, 72, 49-83. [all data]

Lias, Bartmess, et al., 1988
Lias, S.G.; Bartmess, J.E.; Liebman, J.F.; Holmes, J.L.; Levin, R.D.; Mallard, W.G., Gas-phase ion and neutral thermochemistry, J. Phys. Chem. Ref. Data, Suppl. 1, 1988, 17, 1-861. [all data]


Notes

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