Nitrous oxide, protonated

Formula: HN₂O⁺
Molecular weight: 45.0202
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Reaction thermochemistry data

Data compiled by: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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Individual Reactions

HN₂O⁺ + = (HN₂O⁺ • )

By formula: HN₂O⁺ + N₂O = (HN₂O⁺ • N₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.7	kcal/mol	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase
Δ_rH°	20.6	kcal/mol	PHPMS	Szulejko and McMahon, 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.	cal/mol*K	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase
Δ_rS°	31.5	cal/mol*K	PHPMS	Szulejko and McMahon, 1992	gas phase

(HN₂O⁺ • 5) + = (HN₂O⁺ • 6)

By formula: (HN₂O⁺ • 5N₂O) + N₂O = (HN₂O⁺ • 6N₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.8	kcal/mol	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase; Entropy change calculated or estimated
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	30.	cal/mol*K	N/A	Hiraoka, Fujimaki, et al., 1994	gas phase; Entropy change calculated or estimated

(HN₂O⁺ • 2) + = (HN₂O⁺ • 3)

By formula: (HN₂O⁺ • 2N₂O) + N₂O = (HN₂O⁺ • 3N₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.8	kcal/mol	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	25.	cal/mol*K	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase

(HN₂O⁺ • 3) + = (HN₂O⁺ • 4)

By formula: (HN₂O⁺ • 3N₂O) + N₂O = (HN₂O⁺ • 4N₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.4	kcal/mol	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	29.	cal/mol*K	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase

(HN₂O⁺ • 4) + = (HN₂O⁺ • 5)

By formula: (HN₂O⁺ • 4N₂O) + N₂O = (HN₂O⁺ • 5N₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.0	kcal/mol	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	30.	cal/mol*K	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase

(HN₂O⁺ • ) + = (HN₂O⁺ • 2)

By formula: (HN₂O⁺ • N₂O) + N₂O = (HN₂O⁺ • 2N₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.4	kcal/mol	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.	cal/mol*K	PHPMS	Hiraoka, Fujimaki, et al., 1994	gas phase

References

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Hiraoka, Fujimaki, et al., 1994
Hiraoka, K.; Fujimaki, S.; Aruga, K.; Sato, T.; Yamabe, S., Gas-Phase Solavtion of NO+, O2+, N2O+, and H3O+ with N2O, J. Chem. Phys., 1994, 101, 5, 4073, https://doi.org/10.1063/1.467524 . [all data]

Szulejko and McMahon, 1992
Szulejko, J.; McMahon, T.B., personal communication, 1992. [all data]

Notes

Go To: Top, Reaction thermochemistry data, References

Symbols used in this document:

Δ_rH° Enthalpy of reaction at standard conditions

Δ_rS° Entropy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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Δ_rH°	Enthalpy of reaction at standard conditions
Δ_rS°	Entropy of reaction at standard conditions