The molecular weight of Barium chloride (BaCl_{2}) is 208.2324.

To 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 Barium chloride molecule. **From the chemical formula, you will know different atoms and their number in a Barium chloride molecule. Chemical formula of Barium chloride is BaCl

_{2}. From the chemical formula of Barium chloride, it is easy to find out that there are one Barium (Ba) atom and two Chlorine (Cl) atoms in a molecule of Barium chloride.

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

Atomic weight of Barium (Ba): 137.327 (Ref: Pubchem-56, Ciaaw-barium)

Atomic weight of chlorine (Cl) : 35.4527 (Ref: Pubchem-Chlorine, jlab-ele017)

**Step 3: Calculate the molecular weight of Barium chloride by adding the total weight of all atoms. **

Number of Barium atoms in Barium chloride: 1

Atomic weight of Barium: 137.327

Total weight of Barium atoms in Barium chloride: 137.327 x 1 = 137.327

Number of Chlorine atoms in Barium chloride: 2

Atomic weight of Chlorine: 35.4527

Total weight of Chlorine atoms in Barium chloride: 35.4527 x 2 = 70.9054

**Step 4: Calculate the molecular weight of Barium chloride by adding up the total weight of all atoms. **

Molecular weight of Barium chloride (BaCl_{2}):

137.327 (Barium) + 70.9054 (Chlorine)

So the molecular weight of Barium chloride is 208.2324.

Molecular weight of Barium chloride (BaCl_{2}) | |||

Atoms (elements) in Barium chloride | Number of each atom in Barium chloride | Atomic weight | Total weight |

Ba (Barium) | 1 | 137.327 | 137.327 (137.327 x 1) |

Cl (Chlorine) | 2 | 35.4527 | 70.9054 (35.4527 x 2) |

Molecular weight of Barium chloride (BaCl_{2}): | 208.2324 |

## REFERENCES:

- Pubchem-56: https://pubchem.ncbi.nlm.nih.gov/element/56
- Ciaaw-barium: https://www.ciaaw.org/barium.htm
- Jlab-ele056: https://education.jlab.org/itselemental/ele056.html
- Pubchem-Chlorine: https://pubchem.ncbi.nlm.nih.gov/element/Chlorine
- jlab-ele017: https://education.jlab.org/itselemental/ele017.html