The enthalpies of combustion of carbon and carbon monoxide in excess of oxygen at `298K` and constant pressure are `-393.5` and `-283.0 kJ mol^(-1)`, respectively. Calculate the heat of formation of carbon monoxide at constant volume.

Explanation

To calculate the heat of formation of carbon monoxide (CO) at constant volume, we can use the given enthalpies of combustion for carbon and carbon monoxide. Here’s a step-by-step solution:

### Step 1: Write the combustion reactions

1. **Combustion of Carbon:**
\[ C(s) + O_2(g) \rightarrow CO_2(g) \quad \Delta H = -393.5 \, \text{kJ/mol} \]
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