Unpaired Electrons in [Co(NH3)6]Cl3
The complex [Co(NH3)6]Cl3 is a coordination compound consisting of a central cobalt atom surrounded by six ammonia ligands and three chloride ions.

Explanation:
- In the coordination complex [Co(NH3)6]Cl3, the cobalt ion has a +3 oxidation state.
- Cobalt has a d8 electronic configuration in its ground state.
- Each ammonia ligand is a strong field ligand, causing the d-orbitals to split into two sets - t2g (lower energy) and eg (higher energy).
- The six NH3 ligands will occupy the t2g orbitals, leaving the eg orbitals empty.
- Since there are no electrons in the eg set of orbitals, there are 0 unpaired electrons in [Co(NH3)6]Cl3.

Summary:
- The complex [Co(NH3)6]Cl3 has 0 unpaired electrons due to the occupation of all the d-orbitals by the ammonia ligands.