Sodium superoxide

Sodium superoxide
Names
	IUPAC name sodium superoxide
	Other names sodium superoxide; sodium dioxide
Identifiers
CAS Number	1313-60-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	8305406;
PubChem CID	61542;
RTECS number	WE2860010;
UNII	3GSN3JCJ5K ;
UN number	2547
CompTox Dashboard (EPA)	DTXSID30894055 ;
	InChI InChI=1S/Na.HO2/c;1-2/h;1H/q+1;/p-1 Key: TZACNHSIZFFYEH-UHFFFAOYSA-M;
	SMILES [O-][O].[Na+];
Properties
Chemical formula	NaO2
Molar mass	54.9886 g/mol
Appearance	Yellow to orange crystalline solid
Density	2.2 g/cm3
Melting point	551.7 °C (1,025.1 °F; 824.9 K)
Boiling point	Decomposes
Solubility in water	Decomposes
Basicity (pKb)	N/A
Structure
Crystal structure	cubic
Thermochemistry
Heat capacity (C)	72.1 J/mol K
Std molar; entropy (S⦵298)	115.9 J/mol K
Std enthalpy of; formation (ΔfH⦵298)	-260.2 kJ/mol
Gibbs free energy (ΔfG⦵)	-218.4 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H314
Precautionary statements	P210, P220, P260, P280, P303+P361+P353, P305+P351+P338
NFPA 704 (fire diamond)	3 0 1 OX
Flash point	Non flammable
Related compounds
Other anions	sodium oxide; sodium peroxide
Other cations	Lithium superoxide; Potassium superoxide; Rubidium superoxide; Caesium superoxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium superoxide is the inorganic compound with the formula Na O₂.^[1] This yellow-orange solid is a salt of the superoxide anion. It is an intermediate in the oxidation of sodium by oxygen.

^ Hayyan, Maan; Hashim, Mohd Ali; AlNashef, Inas M. (2016-02-15). "Superoxide Ion: Generation and Chemical Implications". Chemical Reviews. 116 (5). American Chemical Society (ACS): 3029–3085. doi:10.1021/acs.chemrev.5b00407. ISSN 0009-2665. PMID 26875845.

[1] Hayyan, Maan; Hashim, Mohd Ali; AlNashef, Inas M. (2016-02-15). "Superoxide Ion: Generation and Chemical Implications". Chemical Reviews. 116 (5). American Chemical Society (ACS): 3029–3085. doi:10.1021/acs.chemrev.5b00407. ISSN 0009-2665. PMID 26875845.

[1]

Names

IUPAC name sodium superoxide
Other names sodium superoxide sodium dioxide
Identifiers
CAS Number	1313-60-6^Y
3D model (JSmol)	Interactive image
ChemSpider	8305406
PubChem CID	61542
RTECS number	WE2860010
UNII	3GSN3JCJ5K^Y
UN number	2547
CompTox Dashboard (EPA)	DTXSID30894055
InChI InChI=1S/Na.HO2/c;1-2/h;1H/q+1;/p-1 Key: TZACNHSIZFFYEH-UHFFFAOYSA-M
SMILES [O-][O].[Na+]
Properties
Chemical formula	NaO₂
Molar mass	54.9886 g/mol
Appearance	Yellow to orange crystalline solid
Density	2.2 g/cm³
Melting point	551.7 °C (1,025.1 °F; 824.9 K)
Boiling point	Decomposes
Solubility in water	Decomposes
Basicity (pK_b)	N/A
Structure
Crystal structure	cubic
Thermochemistry
Heat capacity (C)	72.1 J/mol K
Std molar entropy (S^⦵₂₉₈)	115.9 J/mol K
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	-260.2 kJ/mol
Gibbs free energy (Δ_fG^⦵)	-218.4 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H314
Precautionary statements	P210, P220, P260, P280, P303+P361+P353, P305+P351+P338
NFPA 704 (fire diamond)	3 0 1 OX
Flash point	Non flammable
Related compounds
Other anions	sodium oxide sodium peroxide
Other cations	Lithium superoxide Potassium superoxide Rubidium superoxide Caesium superoxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is ^YN ?) Infobox references

Sodium superoxide

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