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Chapter 17: Problem 40

Determine the oxidation number of each atom in CoO.

Short Answer

Expert verified
The oxidation number of Co in the compound CoO is +2, while the oxidation number of O is -2.

Step by step solution

01

Identify the atoms in the compound

Identify the elements in the compound. In CoO, there are two elements: cobalt (Co) and oxygen (O).
02

Apply the rules of oxidation number

According to the rules of oxidation numbers, the oxidation number of an atom in its pure form or non-combined state is zero. For monoatomic ions, the oxidation number equals the charge on the ion. Oxygen usually has an oxidation number of -2 in its compounds. In CoO, oxygen follows this rule and has an oxidation number of -2.
03

Determine the oxidation number of Co

Use the rule that the sum of the oxidation numbers in a neutral molecule equals zero. In CoO, the sum of the oxidation numbers of Co (which we do not know) and O (which we know is -2) should equal zero. So, let's call the oxidation number or Co as x. Thus, x + (-2) = 0, which implies that x = 2. The oxidation number of Co in the compound CoO is +2.

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