Enthalpy of Ionization Calculation

While performing a thermodynamic experiment, a student made the following observations.
HCl + NaOH → NaCl + H₂O ; ΔH = - 57.3 kJ mol⁻¹
CH₃COOH + NaOH → CH₃COONa + H₂O ; ΔH = - 55.3 kJ mol⁻¹
The enthalpy of ionization of CH₃COOH as calculated by the student is ____ kJ mol⁻¹. [nearest integer]

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