Chemistry - Thermodynamics - I Question with Solution | TestHub

The standard enthalpy of neutralization of strong acid and strong base is$-57.3$$\mathrm{k}\mathrm{J}$${\text{equiv}}^{-1}.$If the enthalpy of neutralization of the first proton of aqueous${\mathrm{H}}_2\mathrm{S}$is$-33.7$$\mathrm{k}\mathrm{J}\mathrm{}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$then the${\left({\text{pK}}_{\text{a}}\right)}_1$of${\mathrm{H}}_2\mathrm{S}$is