Molybdenum trioxide
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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.[8] It is a yellow solid, although impure samples can appear blue or green.
Quick Facts Names, Identifiers ...
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Names | |||
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IUPAC name
Molybdenum trioxide | |||
Other names | |||
Identifiers | |||
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3D model (JSmol) |
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ChEBI | |||
ChemSpider | |||
ECHA InfoCard | 100.013.823 ![]() | ||
EC Number |
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PubChem CID |
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UNII | |||
UN number | 3288 | ||
CompTox Dashboard (EPA) |
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Properties | |||
MoO3 | |||
Molar mass | 143.95 g·mol−1 | ||
Appearance | yellow solid | ||
Odor | odorless | ||
Density | 4.70 g/cm3[1] | ||
Melting point | 802 °C (1,476 °F; 1,075 K)[1] | ||
Boiling point | 1,155 °C (2,111 °F; 1,428 K)(sublimes)[1] | ||
1.066 g/L (18 °C) 4.90 g/L (28 °C) 20.55 g/L (70 °C) | |||
Band gap | >3 eV (direct)[2] | ||
+3.0·10−6 cm3/mol[3] | |||
Structure[4] | |||
Orthorhombic, oP16 | |||
Pnma, No. 62 | |||
a = 1.402 nm, b = 0.37028 nm, c = 0.39663 nm | |||
Formula units (Z) |
4 | ||
see text | |||
Thermochemistry[5] | |||
Heat capacity (C) |
75.0 J K−1 mol−1 | ||
Std molar entropy (S⦵298) |
77.7 J K−1 mol−1 | ||
Std enthalpy of formation (ΔfH⦵298) |
−745.1 kJ/mol | ||
Gibbs free energy (ΔfG⦵) |
-668.0 kJ/mol | ||
Hazards[6] | |||
GHS labelling: | |||
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Warning | |||
H319, H335, H351 | |||
P201, P202, P261, P264, P271, P280, P281, P304+P340, P305+P351+P338, P308+P313, P312, P337+P313, P403+P233, P405, P501 | |||
NFPA 704 (fire diamond) | |||
Flash point | Non-flammable | ||
Lethal dose or concentration (LD, LC): | |||
LD50 (median dose) |
125 mg.kg (rat, oral)[citation needed] 2689 mg/kg (rat, oral)[7] | ||
LDLo (lowest published) |
120 mg Mo/kg (rat, oral) 120 mg Mo/kg (guinea pig, oral)[7] | ||
LC50 (median concentration) |
>5840 mg/m3 (rat, 4 hr)[7] | ||
Related compounds | |||
Other cations |
Chromium trioxide Tungsten trioxide | ||
Related molybdenum oxides |
Molybdenum 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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