Cuprous oxide
Any copper oxide in which the metal is in the +1 oxidation state. — ChEBI
Safety documents & references
1 indexed referencesFind a product-specific SDS
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Identity & molecular properties
Source-linked values| CAS number | 1317-39-1 | ChEBI ↗ |
| Molecular formula | 2Cu.O | ChEBI ↗ |
| Molar mass | 143.091 g/mol | ChEBI ↗ |
| Monoisotopic mass | 141.85411 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:81908 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 143.09 g/mol | PubChem ↗ |
| Exact mass | 141.854109 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 identifiercuprous oxidecopper(1+) oxidocopperKRFJLUBVMFXRPN-UHFFFAOYSA-N[Cu+].[Cu+].[O-2]InChI=1S/2Cu.O/q2*+1;-2Names & 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 governmentCopper (I) oxide (Cu2O) · R06-C-077-JNIOSH
| Endpoint | Reported classification |
|---|---|
| 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 143.091 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
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.