Chapter 19, Problem 63E

Consider the sublimation of iodine at 25.0°C:

   ${\text{I}}_2(s)\to {\text{I}}_2(g)$

1. Find $\Delta G_{\text{rxn}}^{°}$ at 25.0°C.
2. Find $\Delta G_{\text{rxn}}$ at 25.0°C under the following nonstandard conditions:

1. $P_{{\text{I}}_2}=1.00\text{ mmHg}$
2. $P_{{\text{I}}_2}=0.100\text{ mmHg}$

Explain why iodine spontaneously sublimes in open air at 25°C.