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Standard enthalpy of vapourisation \( \Delta \mathrm{H}^{\circ} \) for water is
P \( 40.66 \mathrm{~kJ} \mathrm{~mol}^{-1} \). The internal energy of vapourisation

W of water will be:
(1) \( +43.76 \mathrm{~kJ} \mathrm{~mol}^{-1}(2)+40.66 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
(3) \( +37.56 \mathrm{~kJ} \mathrm{~mol}^{-1} \) (4) None of these
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