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Molybdenum trioxide

Molybdenum trioxide
Names IUPAC name
Molybdenum trioxide
Other names
Molybdic anhydride
Molybdite
Molybdic trioxide
Molybdenum(VI) oxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard100.013.823EC Number
  • 215-204-7
UNII
UN number3288
  • InChI=1S/Mo.3O
    Key: JKQOBWVOAYFWKG-UHFFFAOYSA-N
  • O=[Mo](=O)=O
Properties MoO3Molar mass143.95 g·mol Appearance yellow solid Odorodorless Density4.70 g/cm Melting point802 °C (1,476 °F; 1,075 K) Boiling point1,155 °C (2,111 °F; 1,428 K)(sublimes) 1.066 g/L (18 °C)
4.90 g/L (28 °C)
20.55 g/L (70 °C) Band gap>3 eV (direct) +3.0·10 cm/mol Structure Orthorhombic, oP16Pnma, No. 62
a = 1.402 nm, b = 0.37028 nm, c = 0.39663 nm
4 see textThermochemistry 75.0 J K mol 77.7 J K mol −745.1 kJ/mol −668.0 kJ/mol Hazards GHS labelling: WarningH319, H335, H351P201, P202, P261, P264, P271, P280, P281, P304+P340, P305+P351+P338, P308+P313, P312, P337+P313, P403+P233, P405, P501NFPA 704 (fire diamond)
3
0
OX
Flash pointNon-flammable Lethal dose or concentration (LD, LC): 125 mg.kg (rat, oral)
2689 mg/kg (rat, oral) 120 mg Mo/kg (rat, oral)
120 mg Mo/kg (guinea pig, oral) >5840 mg/m (rat, 4 hr) Related compounds
Other cations
Chromium trioxide
Tungsten trioxideMolybdenum dioxide
"Molybdenum blue"
Related compounds
Molybdic acid
Sodium molybdate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Molybdenum trioxide describes a family of inorganic compounds with the formula MoO3(H2O)n where n = 0, 1, 2. The anhydrous compound is produced on the largest scale of any molybdenum compound since it is the main intermediate produced when molybdenum ores are purified. The anhydrous oxide is a precursor to molybdenum metal, an important alloying agent. It is also an important industrial catalyst. It is a yellow solid, although impure samples can appear blue or green.

Molybdenum trioxide occurs as the rare mineralmolybdite.

Wikipedia source