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At 18^(@)C the heat of solution of anhydrous CuSO_(4) in a large volume of water is -15.90 kcal per mole while that of CuSO_(4).5H_(2)O is 2.75 kcal per mole. What is the heat of hydration of CuSO_(4) ? |
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Answer» Solution :GIVEN that, (i) `CuSO_(4)(s)+aq to CuSO_(4)(aq),DELTAH=-15.9 "kcal"` (ii) `CuSO_(4).5H_(2)O+aq to CuSO_(4)(aq),DeltaH=+2.75 "kcal"` We have to calculate `DeltaH` of the equation : `CuSO_(4)(s)+aq to CuSO_(4).5H_(2)O,DeltaH=?` Applying the inspection method, [Eqn (i)- Eqn (ii)], We get, `CuSO_(4)(s)+aq to CuSO_(4).5H_(2)O,DeltaH=-15.9-2.75=-18.65 "kcal"` |
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