Hydrogen Sulfide

A simple hydride, H2S, 34.083 g/mol. Boiling point -60.33 °C, melting point -85.49 °C, as published.

verified recordSimple hydride8 measured properties

Identifiers

Molecular formula: H₂S
Molecular weight: 34.083 g/mol
Exact mass: 33.987721 g/mol
IUPAC name: sulfane
SMILES: S
InChI: InChI=1S/H2S/h1H2
InChIKey: RWSOTUBLDIXVET-UHFFFAOYSA-N

Open in ReactionLens Use in reaction prediction

Measured properties

Published measurements, each with its source. Two readings of one property are both shown, in the units each used.

Boiling Point: -76.59 °F at 760 mmHg (EPA, 1998)measured · CAMEO Chemicals; -60.33 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Melting Point: -121.9 °F (EPA, 1998)measured · CAMEO Chemicals; -85.49 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Density: 0.916 at -76 °F (EPA, 1998) - Less dense than water; will floatmeasured · CAMEO Chemicals; 1.5392 g/L at 0 °C at 760 mm Hg; Gas: 1.19 (Air = 1.00)measured · Hazardous Substances Data Bank (HSDB)
Solubility: 0.4 % (NIOSH, 2024)measured · CAMEO Chemicals; 1 g dissolves in 94.3 ml absolute alcohol at 20 °C; 1 g dissolves in 48.5 mL ether at 20 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Vapor Pressure: 15200 mmHg at 77.9 °F (EPA, 1998)measured · CAMEO Chemicals; Vapor pressure = 1.56X10+4 mm Hg at 25 °C /from experimentally-derived coefficientsmeasured · Hazardous Substances Data Bank (HSDB)
Flash Point: 500 °Fmeasured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases; Flammable gasmeasured · ILO-WHO International Chemical Safety Cards (ICSCs)
Viscosity: Gas at 101.325 KPa at 25 °C; 0.012 8 m Pa.S; 0.012 8 cP.measured · Matheson Gas Products; Matheson Gas Data Book 6th Ed p.408 (1980)
Refractive Index: INDEX OF REFRACTION (LIQ): 1.374measured · Weast, R.C. (ed.) Handbook of Chemistry and Physics. 69th ed. Boca Raton, FL: CRC Press Inc., 1988-1989., p. B-95

Calculated properties

Derived from the structure, not from a sample; kept apart from the measurements above.

Molecular weight: 34.08 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 33.98772124 Dacalculated · reference compound database; Mass of the most common isotopic form.
XLogP3: 0.5calculated · reference compound database; Estimated oil/water partition, computed by reference compound database.
Polar surface area: 1 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 0calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 1calculated · reference compound database
H-bond acceptors: 1calculated · reference compound database
logP: 0.1128calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 0 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 0calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 0calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 0calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 10.381 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 0calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.3564calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

S Sulfur1 atom · 94.1% by mass
H Hydrogen2 atoms · 5.9% by mass

Percentages are of the molecular weight above, worked out the same way the molar mass calculator does it.

Structure

Heavy atoms, hydrogen excluded: 1
Total atoms, hydrogen included: 3
Rings: 0
Aromatic rings: 0
Stereocentres: 0
Formal charge: 0

The molecule in three dimensions

Rotate and inspect the atoms. Loaded only when you ask, so the page stays light.

The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.

Reactions it appears in

No documented reaction with a written procedure and a source involves Hydrogen Sulfide yet.

Other names for it

The systematic name on this record is sulfane.

The sources also call it Hydrosulfuric acid, Dihydrogen sulfide, Dihydrogen monosulfide, Stink DAMP, Hydrogen sulphide, Sulfureted hydrogen, Sewer gas, Hydrogene sulfure, Acide sulfhydrique, Schwefelwasserstoff, Zwavelwaterstof.

Structurally related

Nothing structurally close to Hydrogen Sulfide has a page here yet.

Seen alongside it in reaction records

Molecules that appear in the same recorded reactions as Hydrogen Sulfide. This says nothing about structure: most of them are the bases, solvents, ligands and catalysts the chemistry needed, and they are here because somebody put them in the same flask.

(3-Mercaptopropyl)trimethoxysilane

formed as a product

C₆H₁₆O₃SSi, 196.344 g/mol.

Where these values came from

reference compound database402
compound record
chemistry engine
structure perception

compound record.

What this page does not claim

Identifiers are copied from the source record, measured values are reported as published, and calculated values are marked as calculated. Nothing here is a hazard, purity or handling assessment — how the library is checked.