The molecular weight of Scandium chloride (ScCl_{3}) is 151.314008.

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

_{3}. From the chemical formula of Scandium chloride, it is easy to find out that there are one Scandium (Sc) atom and three Chlorine (Cl) atoms in a molecule of Scandium chloride.

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

Atomic weight of Scandium (Sc): 44.955908 (Ref: Pubchem-21, Ciaaw-scandium)

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

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

Number of Scandium atoms in Scandium chloride: 1

Atomic weight of Scandium: 44.955908

Total weight of Scandium atoms in Scandium chloride: 44.955908 x 1 = 44.955908

Number of Chlorine atoms in Scandium chloride: 3

Atomic weight of Chlorine: 35.4527

Total weight of Chlorine atoms in Scandium chloride: 35.4527 x 3 = 106.3581

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

Molecular weight of Scandium chloride (ScCl_{3}): 44.955908 (Scandium) + 70.9054 (Chlorine)

So the molecular weight of Scandium chloride is 151.314008.

Molecular weight of Scandium chloride (ScCl_{3}) | |||

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

Sc (Scandium) | 1 | 44.955908 | 44.955908 (44.955908 x 1) |

Cl (Chlorine) | 3 | 35.4527 | 106.3581 (35.4527 x 3) |

Molecular weight of Scandium chloride (ScCl_{3}): | 151.314008 |

## REFERENCES:

- Pubchem-21: https://pubchem.ncbi.nlm.nih.gov/element/21
- Ciaaw-scandium : https://www.ciaaw.org/scandium.htm
- Jlab-ele021: https://education.jlab.org/itselemental/ele021.html
- Pubchem-Chlorine: https://pubchem.ncbi.nlm.nih.gov/element/Chlorine
- jlab-ele017: https://education.jlab.org/itselemental/ele017.html