Propanol \(\left(\mathrm{C}_{3} \mathrm{H}_{7} \mathrm{OH}\right)\) melts at \(-126.5^{\circ} \mathrm{C}\) and boils at \(97.4{ }^{\circ} \mathrm{C}\). Draw a qualitative sketch of how the entropy changes as propanol vapor at \(150^{\circ} \mathrm{C}\) and 1 atm is cooled to solid propanol at \(-150^{\circ} \mathrm{C}\) and \(1 \mathrm{~atm}\).

The qualitative sketch of how the entropy changes as propanol goes from vapor at \(150^{\circ}\mathrm{C}\) to solid at \(-150^{\circ}\mathrm{C}\) will show a general continuous decreasing trend with steeper slopes during the points of phase transition, which are at \(97.4^{\circ}\mathrm{C}\) and \(-126.5^{\circ}\mathrm{C}\). The sketch will have the following features: 1) Initial decrease of entropy as vapor cools down, 2) A more dramatic decrease in entropy at the vapor to liquid phase transition, 3) Decrease of entropy as liquid cools down, 4) Another dramatic decrease in entropy at the liquid to solid phase transition, and 5) Decrease of entropy as solid cools down to its final temperature.