Chemistry: Molecular Approach (4th Edition)

Published by Pearson
ISBN 10: 0134112830
ISBN 13: 978-0-13411-283-1

Chapter 18 - Section 18.4 - Entropy Changes Associated with State Changes - For Practice: 18.1


The sign of $\Delta S$ is: a) Positive b) Negative c) Positive

Work Step by Step

a) During boiling, water changes from liquid to gas. Since gas has higher entropy than liquid, $\Delta S$ is positive. b) Gas is converting to solid state, which leads to decrease in entropy. So, $\Delta S$ is negative c) Number of moles of gas is increasing in this reaction. So, $\Delta S$ is positive.
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