The equivalents of ethylenediamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl₃·4NH₃ is (Round off to the Nearest Integer)

Question

The equivalents of ethylenediamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl₃·4NH₃ is  (Round off to the Nearest Integer)

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Strategy:
 Identify the neutral ligands to be substituted and use the ratio of their denticity to determine how many equivalents of the new ligand are required.

Step 1: Identify the neutral ligands
The complex is CoCl₃·4NH₃, which forms the trans- complex.
The neutral ligands in the coordination sphere are the 4  molecules (monodentate).

Step 2: Determine replacements
Ethylenediamine (en) is a bidentate neutral ligand; each en molecule can replace two purely monodentate ammonia molecules by oc

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