Question

The Bond dissociation Energies of $H_2$, $C{l}_2$, and $HCl$ are $104$, $58$ and $103$ $Kcal$ respectively. The Enthalpy of formation of $HCl$ of $HCl$ gas will be

• A. -44 Kcal
• B. -88 Kcal
• C. -22 Kcal
• D. -11 Kcal

Answer 1

The correct option is C

-22 Kcal

$\Delta H_f=\sum B.E.ofReactants-\sum B.E.ofProducts$