Sulfur exhibits two solid phases, rhombic and monoclinic. Use the accompanying phase diagram for sulfur given below to answer the questions that follow. (A).    How many triple points are in the phase diagram?  (B).   What phases are in equilibrium at the topmost triple point?   (C).   How many phase transitions are there when rhombic sulfur at 1 atm and 80°C is heated to 500°C at constant pressure?

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