Calculate the enthalpy of formation of carbon monoxide (CO) from the following data
(i) `C_((s))+O_(2(g))rarrCO_(2(g)),Delta_(r)H^(0)=-393.5KJ" mole"^(-1)`
(ii) `CO_((g))+(1)/(2)O_(2(g))rarrCO_(2(g)),Delta_(r)H^(0)=-283.5KJ" mole"^(-1)`

Explanation

To calculate the enthalpy of formation of carbon monoxide (CO) from the given data, we will use Hess's law, which states that the total enthalpy change during a chemical reaction is the sum of the enthalpy changes for the individual steps of the reaction, regardless of the pathway taken.

### Step-by-Step Solution:

1. **Write the reactions and their enthalpy changes:**
- Reaction (i):
\[
C_{(s)} + O_{2(g)} \rightarrow CO_{2(g)}, \quad \Delta_rH^{0} = -393.5 \, \text{kJ/mol}
...