The integral enthalpies of solution of anhydrous CuSO4(s) and hydrated CuSO4.5H2O(s) are −70kJ and 10kJ per mol respectively. Determine the magnitude of enthalpy of hydration of 0.1 mole anhydrous CuSO4(s) as :
CuSO4(s)+5H2O⟶CuSO4.5H2O.
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Solution
Total enthalpy of hydration in magnitude is (−70−10=−80) 80 kJ/mole so for 0.1 mole magnitude of enthalpy of hydration is 80×0.1=8kJ.