How hydration enthalpy is related to atomization enthalpy?

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Solution

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Hydration enthalpy is the energy released when bonds of molecules are formed with ions and water molecule. It is the change of enthalpy when 1 mole of gas ions is dissolve in water to give infinitely dilute solution. So, it can be said to be the atomisation enthalpy since in a very dilute solution, the ions are far apart and equivalent to being formed by individual atoms.

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