Chapter 11, Problem 11.13P

1. For the phase transition $C{O}_2\left(s\right)\to C{O}_2\left(g\right),$ predict the sign of $\Delta S.$
2. At what temperature does $C{O}_2$ (s) spontaneously sublime at 1 atm? Use the phase diagram for $C{O}_2$(Figure 11.13) to answer this question.
3. If AH for the sublimation of 1 mol of $C{O}_2$ (s) is 26.1 kJ, calculate $\Delta S$ in (J/K•mol) for this phase transition. (Hint: Use the temperature found in part b to calculate the answer.)