Molar mass of hydrochloric acid (HCl)

The molar mass of hydrochloric acid (HCl) is 36.458 g/mol.

hydrogen chloride

Step-by-step calculation

ElementAtomsAtomic massSubtotal
Hydrogen × 1 1.008 = 1.008
Chlorine × 1 35.45 = 35.45
Total36.458 g/mol

Percent composition by element

  • Hydrogen 2.76%
  • Chlorine 97.24%

Hydrochloric acid facts

  • Hydrochloric acid is a solution of hydrogen chloride gas in water, and it is a strong, corrosive acid with a sharp smell.
  • It is used to clean steel before coating, to control pH in industry, and to make other chemicals, and it is the main acid in human stomach juice.
  • Concentrated hydrochloric acid gives off hydrogen chloride gas that forms a visible mist of tiny acid droplets when it meets moist air.

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FAQ

What is the molar mass of HCl?

The molar mass of hydrochloric acid (HCl) is 36.458 g/mol.

How do you calculate the molar mass of HCl?

Multiply the atomic mass of each element by the number of its atoms in HCl, then add the results: 1 × 1.008 (H) + 1 × 35.45 (Cl) = 36.458 g/mol.

What percentage of HCl is Chlorine?

Chlorine makes up 97.24% of the mass of hydrochloric acid (HCl).