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Question

Calculate EAN of $$[Fe(CO)_5]$$.


Solution

Let oxidation no. of $$Fe=x\\x+(5\times 0)=0\\x=0.$$
$$EAN=(z-x)+2nL\longrightarrow (1)$$ where $$z=\text{ Atomic number of metal}\\x=\text{Oxidation state of metal}\\n=\text{No. of Ligands}\\L=\text{No. of co-ordinate bonds formed by ligand.}$$ 
For $$[Fe{(CO)}_5]\\z=26,\\n=1,\\L=5.$$

On substituting, in $$(i)$$
$$EAN=(28-0)+(2\times 1\times 5)=36$$

Chemistry

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