Water-d2

CAS Registry Number®

7789-20-0

CAS Name

Water-d2

Molecular Formula

D2O

Molecular Mass

20.03

Cite this Page

Water-d2.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/ChemicalDetail.aspx?ref=7789-20-0 (retrieved 2025-07-03) (CAS RN: 7789-20-0).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Boiling Point (1)

    101.42 °C

  • Melting Point (1)

    3.81 °C

  • Density (2)

    1 g/cm³

Source(s)

Other Names and Identifiers

InChI

InChI=1S/H2O/h1H2/i/hD2

InChIKey

InChIKey=XLYOFNOQVPJJNP-ZSJDYOACSA-N

SMILES

O([2H])[2H]

Canonical SMILES

O

Other Names for this Substance

  • Water-d2
  • Water, heavy (D2O)
  • Deuterium oxide
  • Dideuterium oxide
  • Heavy water (D2O)

View All

Deleted or Replaced CAS Registry Numbers

39388-36-8, 156428-50-1

CAS INSIGHTSTM
Aspergillus fungus, computer illustration. This is a toxic fungus that causes diseases in humans.