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The enthalpy of dissolution of BaCl2 and BaCl2 .2H2O(s) are -20.6 & 8.8 KJ /mol The enthalpy of Hydration of BaCl2 to BaCl2.2H2O(s) is 

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answer is -29.4.

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Detailed Solution

ΔHhyd=Δsol Hhydrated -Δsol Hanhydrous =-29.4

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