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The enthalpy of solution of anhydrous CuSO4 in a large volume of water is -66.1 kJ/mole,...

The enthalpy of solution of anhydrous CuSO4 in a large volume of water is -66.1 kJ/mole, while the enthalpy for dissolving CuSO4⋅5H2O in water is +11.5 kJ/mole. What is ΔHrxn for the reaction CuSO4 (s) + 5 H2O (l) → CuSO4·5H2O (s) , in kJ/mole?

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