Given $CH_3COOH(aq) \rightarrow CH_3COO^-(aq) + H^+(aq)$, $\Delta H_{rxn} = 0.004$ kcal g$^{-1}$. Enthalpy change when 1 mole of $Ba(OH)_2$, a strong base, is completely neutralized by $CH_3COOH(aq)$ is ($\Delta H^\circ$ of neutralization of strong acid with strong base is $-13.7$ kcal mol$^{-1}$)