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The hypothetical complex chloridoaquatriamine cobalt (III) chloride can be represented as

1. [CoCl(NH3)3(H2O)]Cl2
2. [Co(NH3)3(H2O)Cl3]
3. [CoCl(NH3)3(H2O)]Cl
4. [Co(NH3)3(H2O)Cl2]

Correct answer: [CoCl(NH3)3(H2O)]Cl2

Solution

The name 'chloridoaquatriamine cobalt (III) chloride' indicates a cobalt (III) complex with one chloride ion, one water molecule (aqua), and three ammonia (amine) ligands in the coordination sphere, along with two chloride ions outside the coordination sphere for charge balance. This matches [CoCl(NH3)3(H2O)]Cl2.

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