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The enthalpies of solution of anhydrous
P \( \mathrm{CuSO}_{4} \) and \( \mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O} \) are -15.89 and 2.80

W kcal \( \mathrm{mol}^{-1} \) respectively. The enthalpy of hydration of \( \mathrm{CuSO}_{4} \) to \( \mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O} \) is:
(1) \( -18.69 \mathrm{kcal} \)
(2) \( 13.09 \mathrm{kcal} \)
(3) \( -13.09 \mathrm{kcal} \)
(4) \( 18.69 \mathrm{kcal} \)
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