Question

Calculate the molar mass of HCl.

Answer 1

Hint We must always remember that Molar mass is different from the Molecular mass. Molar mass is also called the Molecular weight. Molar mass of the chemical compound is the mass of one mole of the compound.

Complete step by step solution:
First, what is a Molar mass? Molar mass, also called the Molecular weight, is the mass of one mole of the substance. It is expressed in the units of $gmo{l^{ - 1}}$.
- We need to follow the following steps to calculate the molar mass.
- First, we have to identify the formula of a given compound or molecule.
- Then determine the number of moles of atoms present in the given compound or molecule.
- Multiply the mass of each atom with the number of moles of the atom.
- Do this for every element present in the compound.
- Finally add all these values.
- The obtained value is expressed in $gmo{l^{ - 1}}$.
Now, consider the given HCl molecule:
Molar mass of HCl =Molar mass of Hydrogen + Molar mass of Chlorine
Molar mass of Hydrochloric acid or HCl = 1 + 35.5 =36.5 $gmo{l^{ - 1}}$.

Therefore, the Molar mass of HCl is 36.5 $gmo{l^{ - 1}}$.

Additional information:
- HCl is known as Hydrochloric acid or muriatic acid.
- It is a colorless liquid.
- It has a pungent smell.
- It is a very strong acid; it dissociates completely in solution.
- Hydrochloric acid is used in the food industry as an additive and for the production of gelatin.

Note: Comparison between molar mass and Molecular mass are given below:

MOLAR MASS	MOLECULAR MASS
Molar mass is the mass of one mole of the substance.	Molecular mass is the mass of the molecule.
It is expressed in $gmo{l^{ - 1}}$.	It is expressed in amu.
It is also known as Molecular weight.	It determines the mass of a single molecule.