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Q. The reaction given below
$BaCl _{2}( g )+2 H _{2} O (\ell) \rightarrow BaCl _{2} \cdot 2 H _{2} O ( s ) ; \Delta H =-x KJ$
The value of $\Delta H$ represents:

Thermodynamics

Solution:

The released enthalpy is called enthalpy of hydration