The molecular weight of Arsenic trisulfide [As_{2}S_{3}] is 246.04119.

Arsenic trisulfide [As_{2}S_{3}] is an inorganic compound of two elements: Arsenic (As) and Sulfur (S). The molecular weight of Arsenic trisulfide is 246.04119 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

**CALCULATION PROCEDURE: Arsenic trisulfide [As**_{2}S_{3}] Molecular Weight Calculation

_{2}S

_{3}] Molecular Weight Calculation

**Step 1: Find out the chemical formula and determine constituent atoms and their number in an Arsenic trisulfide molecule. **From the chemical formula, you will know different atoms and their number in an Arsenic trisulfide molecule. The chemical formula of Arsenic trisulfide is As

_{2}S

_{3}. From the chemical formula, you can find that one molecule of Arsenic trisulfide consists of two Arsenic (As) atoms and three Sulfur (S) atoms.

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

Atomic weight of Arsenic (As): 74.921595 (Ref: Jlab-ele033, ciaaw-arsenic)

Atomic weight of Sulfur (S): 32.066 (Ref: Jlab-ele016)

**Step 3: Calculate the molecular weight of Arsenic trisulfide by adding the total weight of all atoms. **

Number of Arsenic atoms in Arsenic trisulfide: 2

Atomic weight of Arsenic: 74.921595

Total weight of Arsenic atoms in Arsenic trisulfide: 74.921595 x 2 = 149.84319

Number of Sulfur (S) atoms in Arsenic trisulfide: 3

Atomic weight of Sulfur: 32.066

Total weight of Sulfur atoms in Arsenic trisulfide: 32.066 x 3 = 96.198

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

Molecular weight of Arsenic trisulfide: 149.84319 (Arsenic) + 96.198 (Sulfur) = 246.04119

So the molecular weight of Arsenic trisulfide is 246.04119.

**Arsenic trisulfide [As _{2}S_{3}] Molecular Weight Calculation**

Molecular weight of Arsenic trisulfide [As_{2}S_{3}] | |||

Constituent atoms | Number of each atom | Atomic weight | Total weight |

Arsenic (As) | 2 | 74.921595 | 149.84319 |

Sulfur (S) | 3 | 32.066 | 96.198 |

Molecular weight of Arsenic trisulfide [As_{2}S_{3}]: | 246.04119 |

## REFERENCES:

- Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
- ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
- Jlab-ele016: https://education.jlab.org/itselemental/ele016.html

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