Chemistry - Thermochemistry Question with Solution | TestHub

Given the following data
${\text{H}}_{\text{2}}\text{(g)}\to \text{2H(g);}\text{ΔH}\text{=}\text{104}\text{.2}\text{kcal}$
${\text{Cl}}_{\text{2}}\text{(g)}\to \text{2Cl(g);}\text{ΔH}\text{=}\text{58}\text{kcal}$
$\text{HCl}\text{=}\text{H(g)}\text{+}\text{Cl(g);}\text{ΔH}\text{=}\text{103}\text{.2}\text{kcal}$
The standard enthalpy of formation of$\text{HCl(g)}$is