Thermodynamics

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

HCl + NaOH \(\to\) NaCl + H₂O \(\Delta\)H = \(-\)57.3 kJ mol^\(-\)1

CH₃COOH + NaOH \(\to\) CH₃COONa + H₂O \(\Delta\)H = \(-\)55.3 kJ mol^\(-\)1

The enthalpy of ionization of CH₃COOH as calculated by the student is _____________ kJ mol^\(-\)1. (nearest integer)