Chemistry
Pie Chart of a Water Molecule by Mass
Last reviewed on 2026-05-22.
Chemistry — verifiable data, editable template
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A water molecule (H₂O) has two hydrogen atoms and one oxygen atom. By mass, oxygen accounts for 88.8% — hydrogen's contribution is small because each hydrogen atom is so much lighter.
The data
- Oxygen (1 atom) — 88.8 %
- Hydrogen (2 atoms) — 11.2 %
Source
Standard atomic mass values (IUPAC).
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