Chromium(III) oxide
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For chromium(VI) oxide, see Chromium trioxide.
Chromium(III) oxide (or chromia) is an inorganic compound with the formula Cr
2O
3. It is one of the principal oxides of chromium and is used as a pigment. In nature, it occurs as the rare mineral eskolaite.
Quick Facts Names, Identifiers ...
Names | |
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Other names | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.013.783 |
EC Number |
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11116 | |
PubChem CID |
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RTECS number |
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UNII | |
UN number | 3077 |
CompTox Dashboard (EPA) |
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Properties | |
Cr2O3 | |
Molar mass | 151.9904 g/mol |
Appearance | light to dark green, fine crystals |
Density | 5.22 g/cm3 |
Melting point | 2,435 °C (4,415 °F; 2,708 K) |
Boiling point | 4,000 °C (7,230 °F; 4,270 K) |
insoluble | |
Solubility in alcohol | insoluble in alcohol, acetone, acids |
+1960.0×10−6 cm3/mol | |
Refractive index (nD) |
2.551 |
Structure[1] | |
Corundum | |
R3c (No. 167) | |
a = 495 pm, c = 1358 pm | |
Thermochemistry | |
Std molar entropy (S⦵298) |
81 J·mol−1·K−1 |
Std enthalpy of formation (ΔfH⦵298) |
−1128 kJ·mol−1 |
Hazards | |
GHS labelling: | |
Danger | |
H302, H317, H319, H360 | |
P201, P202, P261, P264, P270, P272, P280, P281, P301+P312, P302+P352, P305+P351+P338, P308+P313, P321, P330, P333+P313, P337+P313, P363, P405, P501 | |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 1 mg/m3[2] |
REL (Recommended) |
TWA 0.5 mg/m3[2] |
IDLH (Immediate danger) |
250 mg/m3[2] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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