ThermodynamicsHard

Question

If the enthalpy change for the transition of liquid water to steam is 30 kJ mol-1 at 27oC, the entropy change for the process would be

Options

A.1.0 J mol-1 K-1 
B.1.0 J mol-1 K-1 
C.100 J mol-1 K-1 
D.10 J mol-1 K-1 

Solution

ᐃGo = ᐃHo - TᐃSo
Given, ᐃHvap = 30 kJ mol-1 
ᐃGo = 0 at equilibrium,

= 100 J mol-1 K-1

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