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The enthalpy of dissolution of ${BaCl}_{2}$ and ${BaCl}_{2}$ . $2 H_{2} O (s)$ are -20.6 & 8.8 KJ /mol The enthalpy of Hydration of ${BaCl}_{2}$ to ${BaCl}_{2}$ . $2 H_{2} O (s)$ is

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answer is -29.4.

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Detailed Solution

$({ΔH}_{hyd}) = {(Δ_{sol} H)}_{hydrated} - {(Δ_{sol} H)}_{anhydrous} = - 29.4$

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