The number of CO bridges present in `Fe_(2)(CO)_(9)` is

Explanation

To determine the number of CO bridges present in the compound `Fe_(2)(CO)_(9)`, we can follow these steps:

### Step 1: Understand the Structure of `Fe_(2)(CO)_(9)`
The compound consists of two iron (Fe) atoms and nine carbon monoxide (CO) ligands. In coordination chemistry, CO acts as a ligand that can either bond to a metal atom through a single point (monodentate) or can bridge between two metal atoms (bidentate).

**Hint:** Identify the metal atoms and the total number of ligands in the compound.

### Step 2: Analyze the Bonding
In `Fe_(2)(CO)_(9)`, we need to determine how the CO ligands are arranged around the two iron atoms. Typically, in such compounds, some CO ligands will be terminal (bonded to only one metal) and some will be bridging (bonded to two metals).

**Hint:** Consider how many CO ligands can bond to each iron atom and how many are left to form bridges.

### Step 3: Count the CO Ligands
Given that there are a total of 9 CO ligands and 2 iron atoms, we can start by assigning the bonding. The common arrangement for `Fe_(2)(CO)_(9)` is that 3 CO ligands will act as bridging ligands between the two iron atoms.

**Hint:** Remember that each bridging CO connects two metal centers.

### Step 4: Determine the Number of Bridges
From the analysis, we find that 3 CO ligands are bridging between the two iron atoms. The remaining CO ligands (6) are terminal, bonded to only one iron atom.

**Hint:** Verify the total number of CO ligands to ensure they add up to the total in the compound.

### Conclusion
Thus, the number of CO bridges present in `Fe_(2)(CO)_(9)` is **3**.

**Final Answer:** The number of CO bridges in `Fe_(2)(CO)_(9)` is 3.

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