Subjective Type

What is the ionization energy of water in $$KJ/mol$$? Is it endothermic or exothermic reaction?

Solution

The ionization of water is the energy associated with the process,
$$H_2O(g) +\Delta \to H_2O^+ (g) +e^-$$

The ionization of water involves the removal of the electron from its nonbonding $$2p_y$$ orbital (belonging primarily to the oxygen)

Ionization energy approximately= 1217.61 kJ/mol

Now certainly this process is endothermic as energy is absorbed.

The autoprotolysis of water is represented by the equation
$$2H_2O(l) \rightleftharpoons H_3O^+ +HO^-$$

And again, this is an endothermic process.

We would expect the process to be endothermic given that we break strong $$H-O$$ bonds.

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