Write an expression in the form of a chemical equation of the standard enthalpy of formation of CO.

Explanation

To write the expression for the standard enthalpy of formation of carbon monoxide (CO), we need to follow these steps:

### Step-by-Step Solution:

1. **Identify the Elements**: The standard enthalpy of formation refers to the formation of a compound from its constituent elements in their standard states. For carbon monoxide (CO), the constituent elements are carbon (C) and oxygen (O).

2. **Determine the Standard States**: The standard state of carbon is solid (C(s)), and the standard state of oxygen is diatomic gas (O2(g)).

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