Chapter 19, Problem 75QRT

Use the phase diagram for sulfur for Question 75. The solid forms of sulfur are rhombic and monoclinic.

1. (a) A triple point is defined as a temperature and pressure where three phases are in equilibrium. How many triple points does sulfur have? Indicate the approximate temperature and pressure at each.
2. (b) Which physical states are present at equilibrium under these conditions?
   1. (i) 10⁻² atm and 80 °C
   2. (ii) 10⁻¹ atm and 140 °C
   3. (iii) 10⁻³ atm and 110 °C
   4. (iv) 10⁻⁴ atm and 160 °C

Phase diagram for sulfur, for Question 75.