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Experimental data for HCl (Hydrogen chloride)

22 02 02 11 45
Other names
Acide chlorhydrique; Acido cloridrico; Basilin; Chlorohydric acid; Chlorwasserstoff; Hydrochloric Acid; Hydrochloric acid gas; Hydrochloride; Hydrogen chloride; Muriatic acid; NA 1789;
INChI INChIKey SMILES IUPAC name
InChI=1S/ClH/h1H VEXZGXHMUGYJMC-UHFFFAOYSA-N Cl Hydrogen chloride
State Conformation
1Σ C*V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation -92.31 0.10 kJ mol-1 CODATA
Hfg(0K) enthalpy of formation -92.13 0.10 kJ mol-1 CODATA
Entropy (298.15K) entropy 186.90 0.00 J K-1 mol-1 CODATA
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 8.64 0.00 kJ mol-1 CODATA
Heat Capacity (298.15K) heat capacity 29.14   J K-1 mol-1 Gurvich
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
1 Σ 2886 2991 1979HUB/HER 33.6 3.0 1951Pen/Web:1048

Detailed diatomic data
ωe ωexe ωeye Be αe ZPE reference
2990.925 52.79996 0.21803 10.5933 0.3069985 1483.886 2007Iri:389

vibrational zero-point energy: 1443.0 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for HCl (Hydrogen chloride).
More spectroscopic constants are available at the NIST Physics Laboratory website:
http://physics.nist.gov/PhysRefData/MolSpec/Diatomic/Html/Tables/HCl.html
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
  10.59342   1979HUB/HER

Calculated rotational constants for HCl (Hydrogen chloride).
Product of moments of inertia moments of inertia
1.591331amu Å2   2.642513E-40gm cm2
Geometric Data
picture of Hydrogen chloride

Point Group C∞v


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rHCl 1.275 0.000 1 2 NISTdiatomic re 1H 35Cl

Cartesians
Atom x (Å) y (Å) z (Å)
Cl1 0.0000 0.0000 0.0000
H2 0.0000 0.0000 1.2746

Atom - Atom Distances bond lengths
Distances in Å
  Cl1 H2
Cl1   1.2746
H2 1.2746  

Calculated geometries for HCl (Hydrogen chloride).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-Cl 1

Connectivity
Atom 1 Atom 2
Cl1 H2
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1 1979HUB/HER 1Σ
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