Enthalpy of formation of hydrated ions

Enthalpy of formation of hydrated ions;

This refers to enhtalpy change of  the formations of 1mole of hydrated ions from an element in its standard state. e.g.

Na(s) + aq → Na⁺(aq) + e    ∆H_f,m^Ө(298K) = -240kJmol^-1

The figures are usually quoted on arbitrary scale on which the enthalpy of formation of H⁺(aq) is taken to be zero. i.e.

½ H₂(g) → H⁺(aq) + e  ∆H_f,m^Ө(298K) = 0kJmol^-1

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