Spin only magnetic moment in BM of is:

Question

Spin only magnetic moment in BM of  is:

Canvas Classes · Accepted Answer

Strategy:
 Define the oxidation state of Iron in the complex, note the ligand strengths to determine pairing, and apply the magnetic moment formula.

Step 1: Oxidation state of Fe
In ,  is neutral (0) and  (oxalate) has a charge of -2.
Let x be the oxidation state:
.
 is .

Step 2: Ligand field effect
Carbonyl () is a very strong field ligand, forcing a low-spin configuration for the overall mixed-ligand complex.
All 5 electrons pair up as much as possible in the  orbitals: .
This leaves 1 unpai

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