Find `Delta_(f)H` of HCl (g) if bond energies of `H_(2), Cl_(2)` and HCl are 104, 58, 103 kcal/mol respectively.

Explanation

To find the heat of formation (Δ_fH) of HCl(g) using the given bond energies, we will follow these steps:

### Step 1: Write the formation reaction for HCl
The formation of HCl from its elements in their standard states can be represented as:
\[ \frac{1}{2} \text{H}_2(g) + \frac{1}{2} \text{Cl}_2(g) \rightarrow \text{HCl}(g) \]

### Step 2: Identify bond energies
From the problem, we have the following bond energies:
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