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Standard enthalpy of vaporization \( \Delta \mathrm{H}^{\circ} \) for water at \( 100^{\circ} \mathrm{C} \) is \( 40.66 \mathrm{~kJ} / \mathrm{mol}^{-1} \). The internal energy change of vaporization
P of water at \( 100^{\circ} \mathrm{C}\left(\right. \) in \( \left.\mathrm{kJ} / \mathrm{mol}^{-1}\right) \) is:

W)
(a) \( 37.56 \)
(b) \( -43.16 \)
(c) \( +43.76 \)
(d) \( +40.66 \)
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