What is the correct name for the molecular compound Br2S3?

• A. Dibromine disulfide
• B. Dibromine trisulfide
• C. Bromine trisulfide
• D. Bromine(III) sulfide

Answer: (B)

Verified step by step guidance

1. Identify the elements present in the compound Br2S3. Here, Br stands for bromine and S stands for sulfur.
2. Determine the number of atoms of each element in the molecule. There are 2 bromine atoms and 3 sulfur atoms.
3. Recall the naming rules for molecular (covalent) compounds: use prefixes to indicate the number of atoms of each element. The prefixes are: mono- (1), di- (2), tri- (3), tetra- (4), etc.
4. Apply the prefixes to the element names: 'di-' for 2 bromine atoms and 'tri-' for 3 sulfur atoms. The first element keeps its full name, and the second element's name ends with '-ide'.
5. Combine the parts to form the name: 'Dibromine trisulfide'. This matches the correct naming convention for molecular compounds.