Given, $CH_{3}COOH_{aq} \rightarrow CH_{3}COO^{-}_{aq} + H^{+}_{aq}$
$\Delta H_{rxn}^{o} = 0.004 \, kcal \, gm^{-1}$
Enthalpy change when $1$ mole of $Ba(OH)_{2}$, a strong base, is completely neutralized by $CH_{3}COOH(aq)$ is ($\Delta H^{\circ}$ of neutralization of strong acid with strong base is $= -13.7 \, kcal \, mol^{-1}$)