Selected ATcT [1, 2] enthalpy of formation based on version 1.176 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.172 to include species related to Criegee intermediates that are involved in several ongoing studies[4].

Ammonium hydroxide

Formula: NH4OH (aq, 4 H2O)
CAS RN: 1336-21-6
ATcT ID: 1336-21-6*807
SMILES: [NH4+].[OH-]
InChI: InChI=1S/H3N.H2O/h1H3;1H2
InChIKey: VHUUQVKOLVNVRT-UHFFFAOYSA-N
SMILES: [NH4][OH]
InChI: InChI=1S/H5NO/c1-2/h2H,1H4
InChIKey: AVWWWZOEBBIQQX-UHFFFAOYSA-N
Hills Formula: H5N1O1

2D Image:

[NH4+].[OH-]
Aliases: NH4OH; Ammonium hydroxide; Ammonia monohydrate
Relative Molecular Mass: 35.04584 ± 0.00047

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
-365.43± 0.41kJ/mol

Top contributors to the provenance of ΔfH° of NH4OH (aq, 4 H2O)

The 1 contributors listed below account for 97.7% of the provenance of ΔfH° of NH4OH (aq, 4 H2O).

Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.

Contribution
(%)		TN
ID		 Reaction Measured Quantity Reference
97.71739.1 NH4OH (aq, 1000 H2O) → NH4OH (aq) ΔrH°(298.15 K) = 3.541 ± 0.40 kJ/molNBS Tables 1989, NBS TN270, Parker 1965

Top 10 species with enthalpies of formation correlated to the ΔfH° of NH4OH (aq, 4 H2O)

Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.

Correlation
Coefficent
(%)		Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass		 ATcT ID
100.0 Ammonium hydroxideNH4OH (aq, 1000 H2O)[NH4+].[OH-]-366.38± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*839
99.9 Ammonium hydroxideNH4OH (aq, 12 H2O)[NH4+].[OH-]-366.07± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*816
99.9 Ammonium hydroxideNH4OH (aq, 4.5 H2O)[NH4+].[OH-]-365.54± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*808
99.9 Ammonium hydroxideNH4OH (aq, 2.5 H2O)[NH4+].[OH-]-364.92± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*804
99.9 Ammonium hydroxideNH4OH (aq, 500 H2O)[NH4+].[OH-]-366.39± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*833
99.9 Ammonium hydroxideNH4OH (aq, 50 H2O)[NH4+].[OH-]-366.33± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*822
99.9 Ammonium hydroxideNH4OH (aq, 20 H2O)[NH4+].[OH-]-366.20± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*818
99.9 Ammonium hydroxideNH4OH (aq, 10 H2O)[NH4+].[OH-]-366.00± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*815
99.9 Ammonium hydroxideNH4OH (aq, 2 H2O)[NH4+].[OH-]-364.67± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*803
99.9 Ammonium hydroxideNH4OH (aq, 30 H2O)[NH4+].[OH-]-366.26± 0.41kJ/mol35.04584 ±
0.00047		1336-21-6*820

Most Influential reactions involving NH4OH (aq, 4 H2O)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Influence
Coefficient		 TN
ID		 Reaction Measured Quantity Reference
1.0001746.1 NH4OH (aq, 4 H2O) → NH4OH (aq, 1000 H2O) ΔrH°(298.15 K) = -0.945 ± 0.004 kJ/molNBS Tables 1989, NBS TN270, Parker 1965
1.0001788.1 NH3 (aq, 5 H2O) + H2O (cr,l) → NH4OH (aq, 4 H2O) ΔrH°(298.15 K) = 0 ± 0 cm-1triv
References
1   B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner,
Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited.
J. Phys. Chem. A 108, 9979-9997 (2004) [DOI: 10.1021/jp047912y]
2   B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner,
Active Thermochemical Tables: Thermochemistry for the 21st Century.
J. Phys. Conf. Ser. 16, 561-570 (2005) [DOI: 10.1088/1742-6596/16/1/078]
3   B. Ruscic and D. H. Bross,
Active Thermochemical Tables (ATcT) values based on ver. 1.176 of the Thermochemical Network (2024); available at ATcT.anl.gov
4   T. L. Nguyen et al, ongoing studies (2024)
5   B. Ruscic,
Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables.
Int. J. Quantum Chem. 114, 1097-1101 (2014) [DOI: 10.1002/qua.24605]
6   B. Ruscic and D. H. Bross,
Thermochemistry
Computer Aided Chem. Eng. 45, 3-114 (2019) [DOI: 10.1016/B978-0-444-64087-1.00001-2]
Formula
The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.
Uncertainties
The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.0005 kJ/mol.
Website Functionality Credits
The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.
Acknowledgement
This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.