JEE Main 2022 · 25 Jul · Shift 2, Chemistry question 84

While performing a thermodynamics experiment, a student made the following observations.

$\mathrm{HCl+NaOH\rightarrow NaCl+H_2O}$ $\Delta H=-57.3$ kJ mol$^{-1}$

$\mathrm{CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O}$ $\Delta H=-55.3$ kJ mol$^{-1}$

The enthalpy of ionization of $\mathrm{CH_3COOH}$ as calculated by the student is ______ kJ mol$^{-1}$. (nearest integer)