Write the formulas for following coordination compounds:
(1) Tris (ethane-1, 2-djammine) cobalt (Ill. sulphate
(2) Potassiumtrioxalatoaluminate (1)
(3) Hexacarbonylchromium (0)

Explanation

To write the formulas for the given coordination compounds, we will follow a systematic approach for each compound.

### Step-by-Step Solution:

**(1) Tris(ethane-1,2-diamine) cobalt(III) sulfate**

1. **Identify the components**:
- The ligand is ethane-1,2-diamine (abbreviated as "en"), which is a bidentate ligand.
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