From the following data at `25^(@)C`, calculate the bond energy of O – H bond:
(i) `H_(2)(g) to 2H(g), Delta H_(1) = 104.2 kcal`
(ii) `O_(2)(g) to 2O(g), DeltaH_(2) = 118.4 kcal `
(iii) `H_(2)(g) + 1/2 O_(2)(g) to H_(2)O(g), Delta H_(3) = -57.8 k cal`

Explanation

To calculate the bond energy of the O-H bond from the given data, we can follow these steps:

### Step 1: Write down the relevant reactions and their enthalpy changes.
1. **Dissociation of Hydrogen Gas**:
\[ H_2(g) \rightarrow 2H(g), \quad \Delta H_1 = 104.2 \text{ kcal} \]
2. **Dissociation of Oxygen Gas**:
...