Question

Among the following, for which reaction heat of reaction also represents the bond energy of $HF$?

• A. $HF\text{(g)}\to H^{+}\text{(g)}+F^{-}\text{(g)}$
• B. $HF\text{(g)}\to H\text{(g)}+F\text{(g)}$
• C. $2HF\text{(g)}\to H_2\text{(g)}+F_2\text{(g)}$
• D. $HF\text{(g)}\to \frac{1}{2}{H}_2\text{(g)}+\frac{1}{2}{F}_2\text{(g)}$

Answer 1

The correct option is B $HF\text{(g)}\to H\text{(g)}+F\text{(g)}$

$HF\text{(g)}\to H\text{(g)}+F\text{(g)}$
$\Delta H_{\text{reaction}}=B(H-F)\text{(g)}$