Chromium trioxide
A chromium oxide composed of a single chromium bound (oxidation state +6) to three oxygens; the acidic anhydride of chromic acid. — ChEBI
Safety documents & references
1 indexed referencesFind a product-specific SDS
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Identity & molecular properties
Source-linked values| CAS number | 1333-82-0 | ChEBI ↗ |
| Molecular formula | CrO3 | ChEBI ↗ |
| Molar mass | 99.993 g/mol | ChEBI ↗ |
| Monoisotopic mass | 99.92525 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:48240 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 99.994 g/mol | PubChem ↗ |
| Exact mass | 99.925249 Da | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifierchromium trioxidechromium trioxideWGLPBDUCMAPZCE-UHFFFAOYSA-N[O]=[Cr](=[O])=[O]InChI=1S/Cr.3ONames & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologySafety classification · Japan
NITE / Japanese governmentChromic anhydride · H26-B-138 / R-084
| Endpoint | Reported classification |
|---|---|
| Oxidizing solids | Category 2 |
| Acute toxicity （Oral） | Category 3 |
| Acute toxicity （Dermal） | Category 2 |
| Acute toxicity （Inhalation: Dusts and mists） | Category 2 |
| Skin corrosion/irritation | Category 1 |
| Serious eye damage/eye irritation | Category 1 |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 99.993 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsCrOCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
Selected source associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.