70. The heats of dissolution in water of CuSO4, CuSO4*H2O and CuSO4*5H2O at 18 C are equal to - 15.9; -9.33 and 2.8 kcal/mol. Determine the heats of hydration of CuSO4 to CuSO4*H2O, CuSO4 to CuSO4*5H2O and CuSO4*H2O to CuSO4*5H2O

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