## Chemistry: Molecular Approach (4th Edition)

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