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Problem 70

Consider the evaporation of methanol at $25.0^{\c…

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Problem 69

Consider the sublimation of iodine at $25.0^{\circ} \mathrm{C} :$
$$\mathrm{I}_{2}(s) \longrightarrow \mathrm{I}_{2}(g)$$
\begin{equation}\begin{array}{l}{\text { a. Find } \Delta G_{\mathrm{rxn}}^{\circ} \text { at } 25.0^{\circ} \mathrm{C} \text { . }} \\ {\text { b. Find } \Delta G_{\mathrm{rm}} \text { at } 25.0^{\circ} \mathrm{C} \text { under the following nonstandard }} \\ {\text { conditions: }} \\ \quad{\text { i. } P_{1_{2}}=1.00 \mathrm{mm} \mathrm{Hg}} \\ \quad{\text { ii. } P_{1_{2}}=0.100 \mathrm{mm} \mathrm{Hg}} \\ {\text { c. Explain why iodine spontaneously sublimes in open air at }} \\ {25.0^{\circ} \mathrm{C} .}\end{array}\end{equation}

Answer

PART $\mathrm{A} : \Delta G^{\circ}=19.3 \mathrm{kJ}$
PART $\mathrm{B}-\mathrm{I} : \Delta G=2.9 \mathrm{kJ}$
PART B-II: $\Delta G=-2.9 \mathrm{kJ}$
PART C: See explanation.


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