GATE ME 2014 Set 4 — Question 51
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Thermodynamics → Laws & Properties → Pure Substances & Phase Change
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Question
A closed system contains kg of saturated liquid ammonia at . Heat addition required to convert the entire liquid into saturated vapour at a constant pressure is MJ. If the entropy of the saturated liquid is kJ/kg.K, the entropy (in kJ/kg.K) of saturated vapour is _______
Correct answer
6.4 to 6.7
Solution
For a phase change process at constant pressure and temperature, the process is isothermal and reversible. The change in entropy is given by:Given:
Substituting the values:
Substituting the values:
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