Chemical Name:
The IUPAC name for [Co(NH3)6]Cl3 is Hexaamminecobalt(III) chloride.

Explanation:

1. Metal Complex:
The central metal ion in this compound is cobalt (Co).

2. Ligands:
The ligands attached to the cobalt ion are ammonia molecules (NH3), and there are six ammonia ligands in total.

3. Coordination Number:
The coordination number of the cobalt ion in this complex is 6, as it is surrounded by six ligands.

4. Charge:
The overall charge of the complex is +3, as indicated by the three chloride ions (Cl-) present in the compound.

5. Naming:
In the IUPAC name, "Hexaammine" indicates the presence of six ammonia ligands, "cobalt" specifies the central metal ion, and "(III)" denotes the oxidation state of cobalt as +3. The term "chloride" specifies the anion present in the compound.

6. Formula:
The chemical formula [Co(NH3)6]Cl3 indicates the presence of one cobalt ion coordinated with six ammonia ligands and three chloride ions.

7. Summary:
Therefore, the IUPAC name Hexaamminecobalt(III) chloride accurately describes the composition and structure of the complex compound [Co(NH3)6]Cl3.