(Solved): 3. \( (20 \%) \) The following figure is the phase diagram of sulfur where rh ...

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3. \( (20 \%) \) The following figure is the phase diagram of sulfur where rhombic sulfur means ? ??, monoclinic sulfur means ???, A \( \sim \) are points, and \( (\mathrm{V}) \sim(\mathrm{Z}) \) are regions. Answer the questions. (a) Indicate the points that three phases coexist by the symbols and write down their phases. (b) Calculate the degree of freedom on AC line. (c) Calculate the degree of freedom in (Z). (d) What is the most stable state for sulfur at normal temperature and pressure? (e) Under \( 1 \mathrm{~atm} \), which one is more stable at high temperature, rhombic sulfur or monoclinic sulfur?