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Chemical substance record

Ammonium

14798-03-9H4N18.039 g/mol

An onium cation obtained by protonation of ammonia. — ChEBI

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Identity & molecular properties

Source-linked values
CAS number14798-03-9ChEBI ↗
Molecular formulaH4NChEBI ↗
Molar mass18.039 g/molChEBI ↗
Monoisotopic mass18.03383 DaChEBI ↗
Formal charge1ChEBI ↗
ChEBI identifierCHEBI:28938ChEBI ↗

Cross-source molecular data

PubChem
Molar mass18.039 g/molPubChem ↗
Exact mass18.034374132 DaPubChem ↗

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 identifier
ammonium
ammonium
QGZKDVFQNNGYKY-UHFFFAOYSA-O
[H][N+]([H])([H])[H]
InChI=1S/H3N/h1H3/p+1

Names & synonyms

azanium

Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.

Classification & relationships

ChEBI ontology

Roles recorded in ChEBI

cofactorSaccharomyces cerevisiae metaboliteEscherichia coli metabolitehuman metabolite

Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.

Mass ↔ amount of substance

Calculated from sourced mass
Equivalent amount
0.0554354 mol

Uses 18.039 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.

Elemental composition

Theoretical mass fractions
N
Nitrogen · 1 atom
77.65%
H
Hydrogen · 4 atoms
22.35%

Calculated 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 associations

Sources & record history

Checked 27 Sep 2026
EMBL-EBI ChEBI · CHEBI:28938

Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0

NCBI PubChem · CID 223 · retrieved 2026-09-27

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.