Answer
It will be positive.
Work Step by Step
Entropy refers to the overall chaos in the system. In this process, liquid $C_2H_4F_2$ becomes gaseous. Gases have far more chaos than liquids, so $\Delta S$ is positive for this reaction.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 19 - Chemical Thermodynamics - Exercises - Page 845: 19.2c
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