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  4. Entropy of vaporisation of water at 100°C, if molar heat of vaporisation is 9710 cal mol-1 will be

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Q. Entropy of vaporisation of water at $100^\circ$C, if molar heat of vaporisation is $9710\, cal$ $mol^{-1}$ will be

Thermodynamics

Solution:

$\Delta S_{vap} = \Delta H_{vap} /T_b$ = 9710/373
= 26.032 cal $K^{-1} \, mol^{-1}$