Answer
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.
