Question

why is the complex [Co(en)3]^3+ more stable then [CoFe]^3-

please answer quickly ❤️​

Answer 1

Answer:

because the number of electrons and protons is the same

Answer 2

Chelate Effect

Explanation:

[CoF6]3-  is cobalt (III) hexafluoride complex that has 6 monodentate ligands which is fluorine atom. Monodentate ligands use only one donor atom for complexation.

In the case of  [Co(en)3]^3+, it  is cobalt (III) oxalate complex that has 3 bidentate ligands which are oxalate ions. Bidentate ligands use 2 donor atoms for complexation.

According to chelate effect, a complex is more stable when it forms more chelate rings, which are formed only in complexes that contain one or more polydentate ligands.  

So  [Co(en)3]^3+ is more stable because of the chelate effect.