Mercury(II) oxide
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Mercury(II) oxide, also called mercuric oxide or simply mercury oxide, is the inorganic compound with the formula HgO. It has a red or orange color. Mercury(II) oxide is a solid at room temperature and pressure. The mineral form montroydite is very rarely found.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Mercury(II) oxide | |
Other names | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.040.580 |
KEGG |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 1641 |
CompTox Dashboard (EPA) |
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Properties | |
HgO | |
Molar mass | 216.591 g·mol−1 |
Appearance | Yellow or red solid |
Odor | odorless |
Density | 11.14 g/cm3 |
Melting point | 500 °C (932 °F; 773 K) (decomposes) |
0.0053 g/100 mL (25 °C) 0.0395 g/100 mL (100 °C) | |
Solubility | insoluble in alcohol, ether, acetone, ammonia |
Band gap | 2.2 eV[1] |
−44.0·10−6 cm3/mol | |
Refractive index (nD) |
2.5 (550 nm)[1] |
Thermochemistry | |
Std molar entropy (S⦵298) |
70 J·mol−1·K−1[2] |
Std enthalpy of formation (ΔfH⦵298) |
−90 kJ·mol−1[2] |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Extremely toxic, environmental pollutant |
GHS labelling:[3] | |
Danger | |
H300+H310+H330, H372, H410 | |
P260, P262, P264, P270, P271, P273, P280, P284, P301+P316, P302+P352, P304+P340, P316, P320, P321, P330, P361+P364, P391, P403+P233, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
18 mg/kg (oral, rat)[5] |
Safety data sheet (SDS) | ICSC 0981 |
Related compounds | |
Other anions |
Mercury sulfide Mercury selenide Mercury telluride |
Other cations |
Zinc oxide Cadmium oxide |
Related compounds |
Mercury(I) oxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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