Hydrogen Chloride (HCl) Molecular Weight Calculation

The molecular weight of Hydrogen chloride (HCl) is 36.4607.

Hydrogen Chloride Molecular Weight CalculationTo calculate molecular weight of any compound, the first step is to know the constituent elements (atoms) and their number in that particular compound. Then calculate the total atomic weight of each element by multiplying its atomic weight by its number. The sum of total atomic weight of all constituent elements will be the molecular weight of the compound. Note that the value of atomic weight may differ from different sources.

CALCULATION PROCEDURE

Step 1: Find out the chemical formula and determine constituent atoms and their number in a hydrogen chloride molecule. 
Hydrogen ChlorideFrom the chemical formula, you will know different atoms and their number in a hydrogen chloride molecule. Chemical formula of hydrogen chloride is HCl. From the chemical formula, it is easy to find out that there are one hydrogen (H) atom and one chlorine (Cl) atom in a molecule of hydrogen chloride.

Step 2: Find out atomic weights of each atom (from periodic table). 

Atomic weight of hydrogen (H): 1.008  (Ref: Pubchem-Hydrogen, Lanl-1)
Atomic weight of chlorine (Cl) : 35.4527 (Ref: Pubchem-Chlorine, jlab-ele017)

Step 3: Calculate the total weight of each atom present in hydrogen chloride by multiplying its number by its atomic weight. 

Number of hydrogen atoms in hydrogen chloride: 1
Atomic weight of hydrogen: 1.008
Total weight of hydrogen atoms in hydrogen chloride: 1 x 1.008 = 1.008

Number of chlorine atoms in hydrogen chloride: 1
Atomic weight of chlorine: 35.4527
Total weight of chlorine atoms in hydrogen chloride: 1 x 35.4527 = 35.4527

Step 4: Calculate the molecular weight of hydrogen chloride by adding total weight of all atoms. 

Molecular weight of hydrogen chloride (HCl): 

1.008 (1.008 x 1 hydrogen) + 35.4527 (35.4527 x 1 chlorine)

So the molecular weight of hydrogen chloride is 36.4607.

Molecular weight of Hydrogen Chloride (HCl)
Atoms (elements) in hydrogen chloride
Number of each atom in hydrogen chloride
Atomic weight of each atomTotal weight of each atom in hydrogen chloride
H (Hydrogen)11.0081.008 (1.008 x 1)
Cl (Chlorine)135.452735.4527 (35.4527 x 1)
Molecular weight of HCl: 36.4607

REFERENCES:

  • Pubchem-Hydrogen : https://pubchem.ncbi.nlm.nih.gov/element/Hydrogen 
  • Lanl-1: https://periodic.lanl.gov/1.shtml 
  • jlab-ele017: https://education.jlab.org/itselemental/ele017.html
  • Pubchem-Chlorine: https://pubchem.ncbi.nlm.nih.gov/element/Chlorine

See also:

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