A closed system contains saturated liquid ammonia at $$10^\circ C$$. The mass of ammonia is 5 kg. The amount of heat that is required to convert all thesaturated liquid to vapour at constant pressure is 16.2 MJ. If the entropy of saturated liquid is 0.88 kJ/kg-K, what is the entropy (kJ/kg-K) of saturated vapour process without heat transfer?

A

6.6

B

8.7

C

12.32

D

14.72