Standard enthalpy of vapourisation \( \Delta_{\text {vap }} \mathrm...

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Standard enthalpy of vapourisation \( \Delta_{\text {vap }} \mathrm{H}^{\circ} \) for water at \( 100^{\circ} \mathrm{C} \) is \( 40.66 \mathrm{~kJ} \mathrm{~mol}^{-1} \). The internal energy of vaporisation of water at \( 100^{\circ} \mathrm{C} \) (in \( \mathrm{kJ} \mathrm{mol}^{-1} \) ) is :
(a) \( +37.56 \)
(b) \( -43.76 \)
(c) \( +43.76 \)
(d) \( +40.66 \)
- (Assume water vapour to behave like an ideal gas).
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