Tin(II) oxide

Tin(II) oxide
Names
	IUPAC name Tin(II) oxide
	Other names Stannous oxide; Tin monoxide
Identifiers
CAS Number	21651-19-4 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.040.439
EC Number	244-499-5;
PubChem CID	88989;
RTECS number	XQ3700000;
UNII	JB2MV9I3LS ;
CompTox Dashboard (EPA)	DTXSID2066723 ;
	InChI InChI=1S/O.Sn;
	SMILES O=[Sn];
Properties
Chemical formula	SnO
Molar mass	134.709 g/mol
Appearance	black or red powder when anhydrous, white when hydrated
Density	6.45 g/cm3
Melting point	1,080 °C (1,980 °F; 1,350 K)
Solubility in water	insoluble
Magnetic susceptibility (χ)	−19.0·10−6 cm3/mol
Structure
Crystal structure	tetragonal
Thermochemistry
Std molar; entropy (S⦵298)	56 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−285 kJ·mol−1
Hazards
Flash point	Non-flammable
	NIOSH (US health exposure limits):
PEL (Permissible)	none
REL (Recommended)	TWA 2 mg/m3
IDLH (Immediate danger)	N.D.
Safety data sheet (SDS)	ICSC 0956
Related compounds
Other anions	Tin sulfide; Tin selenide; Tin telluride
Other cations	Carbon monoxide; Silicon monoxide; Germanium(II) oxide; Lead(II) oxide
Related tin oxides	Tin dioxide
	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

Tin(II) oxide (stannous oxide) is a compound with the formula SnO. It is composed of tin and oxygen where tin has the oxidation state of +2. There are two forms, a stable blue-black form and a metastable red form.

^ Tin and Inorganic Tin Compounds: Concise International Chemical Assessment Document 65, (2005), World Health Organization
^ ^a ^b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A23. ISBN 978-0-618-94690-7.
^ ^a ^b ^c NIOSH Pocket Guide to Chemical Hazards. "#0615". National Institute for Occupational Safety and Health (NIOSH).

[1] Tin and Inorganic Tin Compounds: Concise International Chemical Assessment Document 65, (2005), World Health Organization

[b1-2] Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A23. ISBN 978-0-618-94690-7.

[PGCH-3] NIOSH Pocket Guide to Chemical Hazards. "#0615". National Institute for Occupational Safety and Health (NIOSH).

[1]

[2]

[3]

Names



IUPAC name Tin(II) oxide
Other names Stannous oxide Tin monoxide
Identifiers
CAS Number	21651-19-4^Y
3D model (JSmol)	Interactive image
ECHA InfoCard	100.040.439
EC Number	244-499-5
PubChem CID	88989
RTECS number	XQ3700000
UNII	JB2MV9I3LS^Y
CompTox Dashboard (EPA)	DTXSID2066723
InChI InChI=1S/O.Sn
SMILES O=[Sn]
Properties
Chemical formula	SnO
Molar mass	134.709 g/mol
Appearance	black or red powder when anhydrous, white when hydrated
Density	6.45 g/cm³
Melting point	1,080 °C (1,980 °F; 1,350 K)^[1]
Solubility in water	insoluble
Magnetic susceptibility (χ)	−19.0·10⁻⁶ cm³/mol
Structure
Crystal structure	tetragonal
Thermochemistry
Std molar entropy (S^⦵₂₉₈)	56 J·mol⁻¹·K⁻¹^[2]
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−285 kJ·mol⁻¹^[2]
Hazards
Flash point	Non-flammable
NIOSH (US health exposure limits):
PEL (Permissible)	none^[3]
REL (Recommended)	TWA 2 mg/m³^[3]
IDLH (Immediate danger)	N.D.^[3]
Safety data sheet (SDS)	ICSC 0956
Related compounds
Other anions	Tin sulfide Tin selenide Tin telluride
Other cations	Carbon monoxide Silicon monoxide Germanium(II) oxide Lead(II) oxide
Related tin oxides	Tin dioxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references