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Q.

The enthalpy of vaporization of water at 100C is 40.63 kJ mol1. Its entropy of vaporization would be

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a

606.3 J K1mol1

b

808.3 J K1mol1

c

406.3 J K1 mol1

d

108.9 J K1mol1

answer is B.

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Detailed Solution

We know that entropy change in phase transformation is given as:

ΔS=ΔHT =40.63×103Jmol1373K 

So,

 ΔS=108.9 J K1mol1

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