Question

Entropy of vaporisation of water at 100°C, if molar heat of vaporisation is 9710 cals mol⁻¹, will be
(a) 28 cal mol⁻¹ K⁻¹
(b) 26 cal mol⁻¹ K⁻¹
(c) 24 cal mol⁻¹ K⁻¹
(d) 20 cal mol⁻¹ K⁻¹

Answer 1

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Vaporization of liquid leads to an increase in the degree of disorder or entropy.

Entropy of vaporization is a measure of change in entropy during the process of vaporization.

This entropy is positive. Entropy of vaporization ca be  calculated by the following formula.

Molar heat of vaporization of water is 9710 cal/mol

Boiling point of water is 100 C =373K

Therefore Entropy of vaporization :-

26 cal mol⁻¹ K⁻¹

Answer 2

Entropy of vaporization is 26 cal mol⁻¹ K⁻¹